Merge branch 'docs-namespaces-path' into 'master'

Docs: Add link to namespace api doc to clarify URL-encoded path

Closes #57292

See merge request gitlab-org/gitlab-ce!26083

doc/api/namespaces.md

@@ -65,7 +65,7 @@ GET /namespaces?search=foobar
 ```
 
 | Attribute | Type   | Required | Description |
-| --------- | ---- | -------- | ----------- |
+| --------- | ------ | -------- | ----------- |
 | `search`  | string | no       | Returns a list of namespaces the user is authorized to see based on the search criteria |
 
 Example request:
@@ -99,8 +99,8 @@ GET /namespaces/:id
 ```
 
 | Attribute | Type           | Required | Description |
-| --------- | ---- | -------- | ----------- |
-| `id`      | integer/string | yes | ID or path of the namespace |
+| --------- | -------------- | -------- | ----------- |
+| `id`      | integer/string | yes      | ID or [URL-encoded path of the namespace](README.md#namespaced-path-encoding) |
 
 Example request: