Amend moderator/structure task docs

Change docs to clarify that a warning is throw when a mod has a DIFFERENT task than the structure, since I think users do not need to be warned if they just duplicated passing same task twice

plurals/deliberation.py

@@ -387,7 +387,7 @@ def _set_moderator_task_description(self) -> None:
         Set the task description for Moderators.
 
         Logic:
-            - Case 1: Task provided to both Structure and moderator--use moderator's task description but throw a warning to user. But supress warning if system instructions are 'auto'.
+            - Case 1: Different task provided to both Structure and moderator--use moderator's task description but throw a warning to user. But supress warning if system instructions are 'auto'.
             - Case 2: Value provided to neither moderator nor structure: Raise an error.
             - Case 3: Value provided to Structure but not moderator--set moderator's task description to be Structure's
             task description.