Resolve the doc issue in which two asterisks have weird links. (#22896)
Summary:
Asterisks start emphases in rst. We should either escape them or put them as interpreted text.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/22896
Differential Revision: D16282869
Pulled By: zou3519
fbshipit-source-id: 15ec4286434db55fb8357b1a12e6f70ef54f8c66
