fix docstring for fusing functions (#58638)
Summary:
This PR fixes docstrings of fusing functions.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/58638
Reviewed By: H-Huang
Differential Revision: D28584501
Pulled By: jerryzh168
fbshipit-source-id: 77a53a709d968df8ba8f5b613ad7cf225ba2826a
