Fix typo in curl example request

Former-commit-id: 36c24de5

doc/api/merge_requests.md

@@ -429,7 +429,7 @@ DELETE /projects/:id/merge_requests/:merge_request_id
 | `merge_request_id` | integer | yes | The ID of a project's merge request |
 ```bash
-curl --request DELETE --header "PRIVATE-TOKEN: 9koXpg98eAheJpvBs5tK" https://gitlab.example.com/api/v3/projects/4/merge_request/85
+curl --request DELETE --header "PRIVATE-TOKEN: 9koXpg98eAheJpvBs5tK" https://gitlab.example.com/api/v3/projects/4/merge_requests/85
 ```
 ## Accept MR