DOC: release documentation version should be major.minor (#72706)
Summary:
Fixes pytorch/pytorch.github.io#929
The pytorch doc team would like to move to only major.minor documentation at https://pytorch.org/docs/versions.html, not major.minor.patch. This has been done in the CI scripts, but the generated documentation still has the patch version. Remove it when building RELEASE documentation. This allows simplifying the logic, using `'.'.join(torch_version.split('.')[:2])` since we no longer care about trimming off the HASH: it automatically gets removed.
holly1238, brianjo
Pull Request resolved: https://github.com/pytorch/pytorch/pull/72706
Reviewed By: samdow
Differential Revision: D34215815
Pulled By: albanD
fbshipit-source-id: 8437036cc6636674d9ab8b1666f37b561d0527e1
(cherry picked from commit d8caf988f958656f357a497372a782ff69829f9e)
