Fixed a regression

Author: 3coins

jupyter_server_documents/outputs/manager.py

@@ -147,7 +147,7 @@ def clear(self, file_id, cell_id=None):
             pass
 
 
-def create_output_url(self, file_id: str, cell_id: str, output_index: int = None) -> str:
+def create_output_url(file_id: str, cell_id: str, output_index: int = None) -> str:
         """
         Create the URL for an output or stream.