fix lint, remove returns in docstring

datarequest.py

@@ -1895,8 +1895,6 @@ def api_datarequest_dta_post_upload_actions(ctx: rule.Context, request_id: str,
     :param ctx:        Combined type of a callback and rei struct
     :param request_id: Unique identifier of the data request
     :param filename:   Filename of DTA
-
-    :returns: API result
     """
     # Permission check
     datarequest_action_permitted(ctx, request_id, ["DM"], [status.APPROVED,
@@ -1940,8 +1938,6 @@ def api_datarequest_signed_dta_upload_permission(ctx: rule.Context, request_id:
     :param request_id: Unique identifier of the data request
     :param action:     String specifying whether write permission must be granted ("grant") or
                        revoked ("revoke")
-
-    :returns: API result
     """
     # Permission check
     datarequest_action_permitted(ctx, request_id, ["OWN"], [status.DTA_READY])