Update hyperlink syntax for XLA, torchaudio, torchtext, and C++ API (#28019)
Summary:
Tested locally. Should render as such:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/28019
Differential Revision: D18012303
Pulled By: brianjo
fbshipit-source-id: 4b3bd9f63f5d94d474ab13bb06220a112185e924
