Use PEP 570 syntax in comments (#11552)

stdlib/_decimal.pyi

@@ -182,7 +182,7 @@ class Context:
     # even settable attributes like `prec` and `rounding`,
     # but that's inexpressable in the stub.
     # Type checkers either ignore it or misinterpret it
-    # if you add a `def __delattr__(self, __name: str) -> NoReturn` method to the stub
+    # if you add a `def __delattr__(self, name: str, /) -> NoReturn` method to the stub
     prec: int
     rounding: str
     Emin: int

stdlib/_typeshed/dbapi.pyi

@@ -23,7 +23,7 @@ class DBAPICursor(Protocol):
     @property
     def rowcount(self) -> int: ...
     # optional:
-    # def callproc(self, __procname: str, __parameters: Sequence[Any] = ...) -> Sequence[Any]: ...
+    # def callproc(self, procname: str, parameters: Sequence[Any] = ..., /) -> Sequence[Any]: ...
     def close(self) -> object: ...
     def execute(self, operation: str, parameters: Sequence[Any] | Mapping[str, Any] = ..., /) -> object: ...
     def executemany(self, operation: str, seq_of_parameters: Sequence[Sequence[Any]], /) -> object: ...

stdlib/zipfile/__init__.pyi

@@ -44,7 +44,7 @@ class _ZipStream(Protocol):
     # The following methods are optional:
     # def seekable(self) -> bool: ...
     # def tell(self) -> int: ...
-    # def seek(self, __n: int) -> object: ...
+    # def seek(self, n: int, /) -> object: ...
 
 # Stream shape as required by _EndRecData() and _EndRecData64().
 class _SupportsReadSeekTell(Protocol):