Add typing return value to init in nn.Module (#45654)
Summary:
Fixes https://github.com/pytorch/pytorch/issues/45497
Pull Request resolved: https://github.com/pytorch/pytorch/pull/45654
Reviewed By: driazati
Differential Revision: D24068202
Pulled By: malfet
fbshipit-source-id: 4cd9b6ca12b531311302e3cdeeab39bc45d86c94
