Fix typo in docs for interpolate (#46589)
Summary:
Removes a spurious backtick in [the docs for `torch.nn.functional.interpolate`](https://pytorch.org/docs/stable/nn.functional.html?highlight=grid_sample#torch.nn.functional.interpolate)
Pull Request resolved: https://github.com/pytorch/pytorch/pull/46589
Reviewed By: zou3519
Differential Revision: D24422550
Pulled By: ezyang
fbshipit-source-id: c1e6b7de4584b2a3f68b458801a33b3fc71c1944
