[DOC] Use type hints to show annotation in the docs (#79086)
Fixes #44964
Use type hints in the code to show type annotations in the parameters section of the docs.
For the parameters already documented in the docstring, but lack the type annotation, the type hints from the code are used:
| [Before](https://pytorch.org/docs/master/generated/torch.nn.AdaptiveMaxPool1d.html) | [After](https://docs-preview.pytorch.org/79086/generated/torch.nn.AdaptiveMaxPool1d.html) |
| --- | --- |
| <img width="462" alt="image" src="https://user-images.githubusercontent.com/6421097/172954756-96d2d8a6-7df9-4c0f-ad34-c12912a5a740.png"> | <img width="479" alt="image" src="https://user-images.githubusercontent.com/6421097/172954770-a6ce2425-99a6-4853-ac2c-e182c3849344.png"> |
| [Before](https://pytorch.org/docs/master/generated/torch.nn.Linear.html) | [After](https://docs-preview.pytorch.org/79086/generated/torch.nn.Linear.html) |
| --- | --- |
| <img width="482" alt="image" src="https://user-images.githubusercontent.com/6421097/172954992-10ce6b48-44a2-487e-b855-2a15a50805bb.png"> | <img width="471" alt="image" src="https://user-images.githubusercontent.com/6421097/172954839-84012ce6-bf42-432c-9226-d3e81500e72d.png"> |
Ref:
- PR https://github.com/pytorch/pytorch/pull/49294 removed type annotations from signatures in HTML docs.
- Sphinx version was bumped to 5.0.0 in PR #70309
- Duplicated (closed) issues: #78311 and #77501
Pull Request resolved: https://github.com/pytorch/pytorch/pull/79086
Approved by: https://github.com/malfet
