Clarify API descriptions of ID formats

These ID formats can be either the project ID, or the url-encoded
namespace path. Make that clearer to users.

doc/api/notification_settings.md

@@ -123,7 +123,7 @@ curl --header "PRIVATE-TOKEN: <your_access_token>" "https://gitlab.example.com/a
 
 | Attribute | Type | Required | Description |
 | --------- | ---- | -------- | ----------- |
-| `id` | integer/string | yes | The group/project ID or path |
+| `id` | integer or string | yes | The ID, or [URL-encoded path, of the group or project](README.md#namespaced-path-encoding). |
 
 Example response:
 
@@ -149,7 +149,7 @@ curl --request PUT --header "PRIVATE-TOKEN: <your_access_token>" "https://gitlab
 
 | Attribute | Type | Required | Description |
 | --------- | ---- | -------- | ----------- |
-| `id` | integer/string | yes | The group/project ID or path |
+| `id` | integer or string | yes | The ID, or [URL-encoded path, of the group or project](README.md#namespaced-path-encoding) |
 | `level` | string | no | The global notification level |
 | `new_note` | boolean | no | Enable/disable this notification |
 | `new_issue` | boolean | no | Enable/disable this notification |

doc/api/project_clusters.md

@@ -22,7 +22,7 @@ Parameters:
 
 | Attribute | Type    | Required | Description                                           |
 | --------- | ------- | -------- | ----------------------------------------------------- |
-| `id`      | integer | yes      | The ID of the project owned by the authenticated user |
+| `id`      | integer or string | yes      | The ID or [URL-encoded path of the project](README.md#namespaced-path-encoding) owned by the authenticated user |
 
 Example request:
 
@@ -92,7 +92,7 @@ Parameters:
 
 | Attribute    | Type    | Required | Description                                           |
 | ------------ | ------- | -------- | ----------------------------------------------------- |
-| `id`         | integer | yes      | The ID of the project owned by the authenticated user |
+| `id`         | integer or string | yes      | The ID or [URL-encoded path of the project](README.md#namespaced-path-encoding) owned by the authenticated user |
 | `cluster_id` | integer | yes      | The ID of the cluster                                 |
 
 Example request:
@@ -186,7 +186,7 @@ Parameters:
 
 | Attribute                                            | Type    | Required | Description                                                                                           |
 | ---------------------------------------------------- | ------- | -------- | ----------------------------------------------------------------------------------------------------- |
-| `id`                                                 | integer | yes      | The ID of the project owned by the authenticated user                                                 |
+| `id`                                                 | integer or string | yes      | The ID or [URL-encoded path of the project](README.md#namespaced-path-encoding) owned by the authenticated user                                                 |
 | `name`                                               | string  | yes      | The name of the cluster                                                                               |
 | `domain`                                             | string  | no       | The [base domain](../user/project/clusters/index.md#base-domain) of the cluster                       |
 | `management_project_id`                              | integer | no       | The ID of the [management project](../user/clusters/management_project.md) for the cluster            |
@@ -283,7 +283,7 @@ Parameters:
 
 | Attribute                                   | Type    | Required | Description                                                                                |
 | ------------------------------------------- | ------- | -------- | ------------------------------------------------------------------------------------------ |
-| `id`                                        | integer | yes      | The ID of the project owned by the authenticated user                                      |
+| `id`                                        | integer or string | yes      | The ID or [URL-encoded path of the project](README.md#namespaced-path-encoding) owned by the authenticated user                                      |
 | `cluster_id`                                | integer | yes      | The ID of the cluster                                                                      |
 | `name`                                      | string  | no       | The name of the cluster                                                                    |
 | `domain`                                    | string  | no       | The [base domain](../user/project/clusters/index.md#base-domain) of the cluster            |
@@ -395,7 +395,7 @@ Parameters:
 
 | Attribute    | Type    | Required | Description                                           |
 | ------------ | ------- | -------- | ----------------------------------------------------- |
-| `id`         | integer | yes      | The ID of the project owned by the authenticated user |
+| `id`         | integer or string | yes      | The ID or [URL-encoded path of the project](README.md#namespaced-path-encoding) owned by the authenticated user |
 | `cluster_id` | integer | yes      | The ID of the cluster                                 |
 
 Example request:

doc/api/project_snippets.md

@@ -239,7 +239,7 @@ curl "https://gitlab.com/api/v4/projects/1/snippets/2/files/master/snippet%2Erb/
 
 > [Introduced](https://gitlab.com/gitlab-org/gitlab-foss/-/issues/29508) in GitLab 9.4.
 
-Available only for users with Administrator [permissions](../user/permissions.md).
+Available only for users with the Administrator [role](../user/permissions.md).
 
 ```plaintext
 GET /projects/:id/snippets/:snippet_id/user_agent_detail
@@ -247,7 +247,7 @@ GET /projects/:id/snippets/:snippet_id/user_agent_detail
 
 | Attribute     | Type    | Required | Description                          |
 |---------------|---------|----------|--------------------------------------|
-| `id`          | Integer | yes      | The ID of a project                  |
+| `id`          | integer or string | yes      | The ID or [URL-encoded path of a project](README.md#namespaced-path-encoding). |
 | `snippet_id`  | Integer | yes      | The ID of a snippet                  |
 
 Example request:

doc/api/resource_access_tokens.md

@@ -20,7 +20,7 @@ GET projects/:id/access_tokens
 
 | Attribute | Type    | required | Description         |
 |-----------|---------|----------|---------------------|
-| `id` | integer/string | yes | The ID of the project |
+| `id` | integer or string | yes | The ID or [URL-encoded path of the project](README.md#namespaced-path-encoding) |
 
 ```shell
 curl --header "PRIVATE-TOKEN: <your_access_token>" "https://gitlab.example.com/api/v4/projects/<project_id>/access_tokens"
@@ -55,9 +55,9 @@ POST projects/:id/access_tokens
 
 | Attribute | Type    | required | Description         |
 |-----------|---------|----------|---------------------|
-| `id` | integer/string | yes | The ID of the project |
+| `id` | integer or string | yes | The ID or [URL-encoded path of the project](README.md#namespaced-path-encoding) |
 | `name` | String | yes | The name of the project access token  |
-| `scopes` | Array\[String] | yes | [List of scopes](../user/project/settings/project_access_tokens.md#limiting-scopes-of-a-project-access-token) |
+| `scopes` | `Array[String]` | yes | [List of scopes](../user/project/settings/project_access_tokens.md#limiting-scopes-of-a-project-access-token) |
 | `expires_at` | Date | no | The token expires at midnight UTC on that date |
 
 ```shell
@@ -96,8 +96,8 @@ DELETE projects/:id/access_tokens/:token_id
 
 | Attribute | Type    | required | Description         |
 |-----------|---------|----------|---------------------|
-| `id` | integer/string | yes | The ID of the project |
-| `token_id` | integer/string | yes | The ID of the project access token |
+| `id` | integer or string | yes | The ID or [URL-encoded path of the project](README.md#namespaced-path-encoding) |
+| `token_id` | integer or string | yes | The ID of the project access token |
 
 ```shell
 curl --request DELETE --header "PRIVATE-TOKEN: <your_access_token>" "https://gitlab.example.com/api/v4/projects/<project_id>/access_tokens/<token_id>"