[Docs] Fix the syntax of documentation (#69958)
Summary:
Fixes the syntax of documentation in the file torch/nn/utils/clip_grad.py
Pull Request resolved: https://github.com/pytorch/pytorch/pull/69958
Reviewed By: mruberry
Differential Revision: D33160612
Pulled By: albanD
fbshipit-source-id: 2dc199fee345bb4c75632900bc6f73a1ab8192a6
