Fix multiple docstring type mistakes (#82474)
### Description
* Docstrings using `(tuple of ints)` shows up as `(tuple of python:ints)`, so I fixed them by making the `int` no longer plural. Example: https://pytorch.org/docs/stable/generated/torch.permute.html#torch.permute
* A docstring type in JIT had one of its types incorrectly highlighted as code. Example: https://pytorch.org/docs/stable/generated/torch.jit.script.html#torch.jit.script
* I found some docstring type usages of `string` that had not yet been converted to `str` after #82410
* Some docstrings incorrectly listed their defaults inside the docstring types.
* I also found a docstring that was missing its type
### Testing
No testing should be required.
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In the developer guidelines, there should probably be standards listed for the docstring types.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/82474
Approved by: https://github.com/albanD
