stdlib: correct many pos-or-kw arg names in dunder methods (#7451)

stdlib/ctypes/__init__.pyi

@@ -49,7 +49,7 @@ class CDLL:
         ) -> None: ...
 
     def __getattr__(self, name: str) -> _NamedFuncPointer: ...
-    def __getitem__(self, name: str) -> _NamedFuncPointer: ...
+    def __getitem__(self, name_or_ordinal: str) -> _NamedFuncPointer: ...
 
 if sys.platform == "win32":
     class OleDLL(CDLL): ...