Updated Release API docs

Updated 'milestone' param to 'milestones'.
Updated payload examples accordingly.

doc/api/releases/index.md

@@ -57,7 +57,8 @@ Example response:
          "committer_email":"admin@example.com",
          "committed_date":"2019-01-03T01:55:38.000Z"
       },
-      "milestone":{
+      "milestones": [
+         {
             "id":51,
             "iid":1,
             "project_id":24,
@@ -68,8 +69,22 @@ Example response:
             "updated_at":"2019-07-12T19:45:44.256Z",
             "due_date":"2019-08-16T11:00:00.256Z",
             "start_date":"2019-07-30T12:00:00.256Z",
-         "web_url":"http://localhost:3000/root/awesome-app/-/milestones/1"
+            "web_url":"https://gitlab.example.com/root/awesome-app/-/milestones/1"
          },
+         {
+            "id":52,
+            "iid":2,
+            "project_id":24,
+            "title":"v1.0",
+            "description":"Voluptate fugiat possimus quis quod aliquam expedita.",
+            "state":"closed",
+            "created_at":"2019-07-16T14:00:12.256Z",
+            "updated_at":"2019-07-16T14:00:12.256Z",
+            "due_date":"2019-08-16T11:00:00.256Z",
+            "start_date":"2019-07-30T12:00:00.256Z",
+            "web_url":"https://gitlab.example.com/root/awesome-app/-/milestones/2"
+         }
+      ],
       "assets":{
          "count":6,
          "sources":[
@@ -218,7 +233,8 @@ Example response:
       "committer_email":"admin@example.com",
       "committed_date":"2019-01-03T01:53:28.000Z"
    },
-   "milestone":{
+   "milestones": [
+       {
          "id":51,
          "iid":1,
          "project_id":24,
@@ -229,8 +245,22 @@ Example response:
          "updated_at":"2019-07-12T19:45:44.256Z",
          "due_date":"2019-08-16T11:00:00.256Z",
          "start_date":"2019-07-30T12:00:00.256Z",
-      "web_url":"http://localhost:3000/root/awesome-app/-/milestones/1"
+         "web_url":"https://gitlab.example.com/root/awesome-app/-/milestones/1"
        },
+       {
+         "id":52,
+         "iid":2,
+         "project_id":24,
+         "title":"v1.0",
+         "description":"Voluptate fugiat possimus quis quod aliquam expedita.",
+         "state":"closed",
+         "created_at":"2019-07-16T14:00:12.256Z",
+         "updated_at":"2019-07-16T14:00:12.256Z",
+         "due_date":"2019-08-16T11:00:00.256Z",
+         "start_date":"2019-07-30T12:00:00.256Z",
+         "web_url":"https://gitlab.example.com/root/awesome-app/-/milestones/2"
+       }
+   ],
    "assets":{
       "count":4,
       "sources":[
@@ -273,7 +303,7 @@ POST /projects/:id/releases
 | `tag_name`         | string          | yes      | The tag where the release will be created from.                                                                                  |
 | `description`      | string          | yes      | The description of the release. You can use [markdown](../../user/markdown.md).                                                  |
 | `ref`              | string          | no       | If `tag_name` doesn't exist, the release will be created from `ref`. It can be a commit SHA, another tag name, or a branch name. |
-| `milestone`        | string          | no       | The title of the milestone the release is associated with.                                                                       |
+| `milestones`       | array of string | no       | The title of each milestone the release is associated with.                                                                      |
 | `assets:links`     | array of hash   | no       | An array of assets links.                                                                                                        |
 | `assets:links:name`| string          | required by: `assets:links` | The name of the link.                                                                                         |
 | `assets:links:url` | string          | required by: `assets:links` | The url of the link.                                                                                          |
@@ -283,7 +313,7 @@ Example request:
 
 ```sh
 curl --header 'Content-Type: application/json' --header "PRIVATE-TOKEN: gDybLx3yrUK_HLp3qPjS" \
-     --data '{ "name": "New release", "tag_name": "v0.3", "description": "Super nice release", "milestone": "v1.0-rc", "assets": { "links": [{ "name": "hoge", "url": "https://google.com" }] } }' \
+     --data '{ "name": "New release", "tag_name": "v0.3", "description": "Super nice release", "milestones": ["v1.0", "v1.0-rc"], "assets": { "links": [{ "name": "hoge", "url": "https://google.com" }] } }' \
      --request POST https://gitlab.example.com/api/v4/projects/24/releases
 ```
 
@@ -321,19 +351,34 @@ Example response:
       "committer_email":"admin@example.com",
       "committed_date":"2019-01-03T01:55:38.000Z"
    },
-   "milestone":{
+   "milestones": [
+       {
          "id":51,
          "iid":1,
          "project_id":24,
          "title":"v1.0-rc",
          "description":"Voluptate fugiat possimus quis quod aliquam expedita.",
-      "state":"active",
+         "state":"closed",
          "created_at":"2019-07-12T19:45:44.256Z",
          "updated_at":"2019-07-12T19:45:44.256Z",
          "due_date":"2019-08-16T11:00:00.256Z",
          "start_date":"2019-07-30T12:00:00.256Z",
-      "web_url":"http://localhost:3000/root/awesome-app/-/milestones/1"
+         "web_url":"https://gitlab.example.com/root/awesome-app/-/milestones/1"
        },
+       {
+         "id":52,
+         "iid":2,
+         "project_id":24,
+         "title":"v1.0",
+         "description":"Voluptate fugiat possimus quis quod aliquam expedita.",
+         "state":"closed",
+         "created_at":"2019-07-16T14:00:12.256Z",
+         "updated_at":"2019-07-16T14:00:12.256Z",
+         "due_date":"2019-08-16T11:00:00.256Z",
+         "start_date":"2019-07-30T12:00:00.256Z",
+         "web_url":"https://gitlab.example.com/root/awesome-app/-/milestones/2"
+       }
+   ],
    "assets":{
       "count":5,
       "sources":[
@@ -375,18 +420,18 @@ PUT /projects/:id/releases/:tag_name
 ```
 
 | Attribute     | Type            | Required | Description                                                                                                 |
-| ------------- | -------------- | -------- | --------------------------------------------------------------------------------------------------------- |
+| ------------- | --------------- | -------- | ----------------------------------------------------------------------------------------------------------- |
 | `id`          | integer/string  | yes      | The ID or [URL-encoded path of the project](../README.md#namespaced-path-encoding).                         |
 | `tag_name`    | string          | yes      | The tag where the release will be created from.                                                             |
 | `name`        | string          | no       | The release name.                                                                                           |
 | `description` | string          | no       | The description of the release. You can use [markdown](../../user/markdown.md).                             |
-| `milestone`   | string         | no       | The title of the milestone to associate with the release (`""` to remove the milestone from the release). |
+| `milestones`  | array of string | no       | The title of each milestone to associate with the release (`[]` to remove all milestones from the release). |
 | `released_at` | datetime        | no       | The date when the release will be/was ready. Expected in ISO 8601 format (`2019-03-15T08:00:00Z`).          |
 
 Example request:
 
 ```sh
-curl --header 'Content-Type: application/json' --request PUT --data '{"name": "new name", "milestone": "v1.0"}' --header "PRIVATE-TOKEN: gDybLx3yrUK_HLp3qPjS" "https://gitlab.example.com/api/v4/projects/24/releases/v0.1"
+curl --header 'Content-Type: application/json' --request PUT --data '{"name": "new name", "milestones": ["v1.2"]}' --header "PRIVATE-TOKEN: gDybLx3yrUK_HLp3qPjS" "https://gitlab.example.com/api/v4/projects/24/releases/v0.1"
 ```
 
 Example response:
@@ -423,9 +468,10 @@ Example response:
       "committer_email":"admin@example.com",
       "committed_date":"2019-01-03T01:53:28.000Z"
    },
-   "milestone":{
+   "milestones": [
+      {
          "id":53,
-      "iid":2,
+         "iid":3,
          "project_id":24,
          "title":"v1.0",
          "description":"Voluptate fugiat possimus quis quod aliquam expedita.",
@@ -434,8 +480,9 @@ Example response:
          "updated_at":"2019-09-01T13:00:00.256Z",
          "due_date":"2019-09-20T13:00:00.256Z",
          "start_date":"2019-09-05T12:00:00.256Z",
-      "web_url":"http://localhost:3000/root/awesome-app/-/milestones/3"
-   },
+         "web_url":"https://gitlab.example.com/root/awesome-app/-/milestones/3"
+      }
+   ],
    "assets":{
       "count":4,
       "sources":[