Issue 43057 (#43063)
Summary:
A small change that adds a docstring that can be found with
`getattr(nn.Module, nn.Module.forward.__name__, None).__doc__`
Fixes https://github.com/pytorch/pytorch/issues/43057
Pull Request resolved: https://github.com/pytorch/pytorch/pull/43063
Reviewed By: mrshenli
Differential Revision: D23161782
Pulled By: ezyang
fbshipit-source-id: 95456f858e2b6a0e41ae551ea4ec2e78dd35ee3f
