DOC: udate left navbar links for vision and text (#51103)
Summary:
A tiny PR to update the links in the lefthand navbar under Libraries. The canonical link for vision and text is `https://pytorch.org/vision/stable` and `https://pytorch.org/text/stable` respectively. The link without the `/stable` works via a redirect, this is cleaner.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/51103
Reviewed By: izdeby
Differential Revision: D26079760
Pulled By: heitorschueroff
fbshipit-source-id: df1fa64d7895831f4e6242445bae02c1faa5e4dc
