Added GLU and FeatureAlphaDropout to nn docs (#60590)
Summary:
Fixes https://github.com/pytorch/pytorch/issues/60563 and https://github.com/pytorch/pytorch/issues/60570
Pull Request resolved: https://github.com/pytorch/pytorch/pull/60590
Reviewed By: albanD
Differential Revision: D29352372
Pulled By: jbschlosser
fbshipit-source-id: f81dd65deab1848a68dc202df252c416ce5214d0
