explain redundant branch/tag filters (#38169)
Summary:
Add a comment because at first glance there doesn't seem to be any need to specify branch and tag filters, just to make them glob to everything.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/38169
Differential Revision: D21496261
Pulled By: kostmo
fbshipit-source-id: 7f75bb466ceffd6b17d4c97d711a8eb6e8b3143a
