squash!: Fix swagger docs

Author: rodmgwgu

openedx/core/djangoapps/content_libraries/rest_api/libraries.py

@@ -692,7 +692,7 @@ def retrieve(self, request, lib_key_str, pk=None):
 
 @method_decorator(non_atomic_requests, name="dispatch")
 @view_auth_classes()
-class LibraryBackupView(GenericAPIView):
+class LibraryBackupView(APIView):
     """
     **Use Case**
     * Start an asynchronous task to back up the content of a library to a .zip file
@@ -741,9 +741,8 @@ class LibraryBackupView(GenericAPIView):
 
     """
 
-    serializer_class = LibraryBackupResponseSerializer
-
     @apidocs.schema(
+        body=None,
         responses={200: LibraryBackupResponseSerializer}
     )
     @convert_exceptions
@@ -772,7 +771,7 @@ def post(self, request, lib_key_str):
     @convert_exceptions
     def get(self, request, lib_key_str):
         """
-        Get the status of the latest backup task for the specified library.
+        Get the status of the specified or latest backup task for the specified library.
         """
         library_key = LibraryLocatorV2.from_string(lib_key_str)
         api.require_permission_for_library_key(library_key, request.user, permissions.CAN_EDIT_THIS_CONTENT_LIBRARY)