Core: update World method comment (#3866)

worlds/AutoWorld.py

@@ -342,7 +342,7 @@ def __getattr__(self, item: str) -> Any:
 
     # overridable methods that get called by Main.py, sorted by execution order
     # can also be implemented as a classmethod and called "stage_<original_name>",
-    # in that case the MultiWorld object is passed as an argument, and it gets called once for the entire multiworld.
+    # in that case the MultiWorld object is passed as the first argument, and it gets called once for the entire multiworld.
     # An example of this can be found in alttp as stage_pre_fill
 
     @classmethod