Add mypy error codes to '# type: ignore' comments (#6379)

stdlib/http/client.pyi

@@ -96,7 +96,7 @@ class HTTPResponse(io.BufferedIOBase, BinaryIO):
     def read(self, amt: int | None = ...) -> bytes: ...
     def read1(self, n: int = ...) -> bytes: ...
     def readinto(self, b: WriteableBuffer) -> int: ...
-    def readline(self, limit: int = ...) -> bytes: ...  # type: ignore
+    def readline(self, limit: int = ...) -> bytes: ...  # type: ignore[override]
     @overload
     def getheader(self, name: str) -> str | None: ...
     @overload