Update docstring

services/text_service.py

@@ -58,6 +58,7 @@ class TextService:
             from_edit_command (bool, optional): Called from the edit command. Defaults to False.
             codex (bool, optional): Pass along that we want to use a codex model. Defaults to False.
             model (str, optional): Which model to genereate output with. Defaults to None.
+            user (discord.User, optinal): An user object that can be used to set the stop. Defaults to None.
             custom_api_key (str, optional): per-user api key. Defaults to None.
             edited_request (bool, optional): If we're doing an edited message. Defaults to False.
             redo_request (bool, optional): If we're redoing a previous prompt. Defaults to False.