fixed swagger API documentation for POST /tasks/{id}/data endpoint (#1963)

cvat/apps/engine/views.py

@@ -389,7 +389,9 @@ class TaskViewSet(auth.TaskGetQuerySetMixin, viewsets.ModelViewSet):
 
         return Response(serializer.data)
 
-    @swagger_auto_schema(method='post', operation_summary='Method permanently attaches images or video to a task')
+    @swagger_auto_schema(method='post', operation_summary='Method permanently attaches images or video to a task',
+        request_body=DataSerializer,
+    )
     @swagger_auto_schema(method='get', operation_summary='Method returns data for a specific task',
         manual_parameters=[
             openapi.Parameter('type', in_=openapi.IN_QUERY, required=True, type=openapi.TYPE_STRING,
@@ -879,4 +881,4 @@ def _export_annotations(db_task, rq_id, request, format_name, action, callback,
         args=(db_task.id, format_name, server_address), job_id=rq_id,
         meta={ 'request_time': timezone.localtime() },
         result_ttl=ttl, failure_ttl=ttl)
-    return Response(status=status.HTTP_202_ACCEPTED)
+    return Response(status=status.HTTP_202_ACCEPTED)