Docs: remove duplicate entry for assignee_ids

doc/api/merge_requests.md

@@ -1060,8 +1060,7 @@ POST /projects/:id/merge_requests
 | `target_branch`            | string  | yes      | The target branch.                                                               |
 | `title`                    | string  | yes      | Title of MR.                                                                     |
 | `assignee_id`              | integer | no       | Assignee user ID.                                                                |
-| `assignee_ids`             | integer array | no | The ID of the user(s) to assign the MR to. Set to `0` or provide an empty value to unassign all assignees.  |
-| `assignee_ids`             | integer array | no | The ID of the user(s) to assign the MR to. If set to `0` or left empty, there will be no assignees added.  |
+| `assignee_ids`             | integer array | no | The ID of the user(s) to assign the MR to. Set to `0` or provide an empty value to unassign all assignees. |
 | `reviewer_ids`             | integer array | no | The ID of the user(s) added as a reviewer to the MR. If set to `0` or left empty, there will be no reviewers added.  |
 | `description`              | string  | no       | Description of MR. Limited to 1,048,576 characters. |
 | `target_project_id`        | integer | no       | The target project (numeric ID).                                                 |