Update DOC, from_project_id only permits ID not URL encoded path of project

doc/api/repositories.md

@@ -162,7 +162,7 @@ Supported attributes:
 | `id`              | integer/string | yes      | The ID or [URL-encoded path of the project](README.md#namespaced-path-encoding) owned by the authenticated user. |
 | `from`            | string         | yes      | The commit SHA or branch name. |
 | `to`              | string         | yes      | The commit SHA or branch name. |
-| `from_project_id` | integer/string | no       | The ID or [URL-encoded path of the project](README.md#namespaced-path-encoding) to compare from |
+| `from_project_id` | integer        | no       | The ID to compare from |
 | `straight`        | boolean        | no       | Comparison method, `true` for direct comparison between `from` and `to` (`from`..`to`), `false` to compare using merge base (`from`...`to`)'. Default is `false`. |
 
 ```plaintext