cpp docs push fix (#87614)
currently failing with
```
To https://github.com/pytorch/cppdocs
+ 2825b2745bb...80ec4daa657 HEAD -> pytorchbot/temp-branch-cpp (forced update)
Branch 'master' set up to track remote branch 'pytorchbot/temp-branch-cpp' from 'origin'.
++ sleep 30
++ git push -u origin
fatal: The upstream branch of your current branch does not match
the name of your current branch. To push to the upstream branch
on the remote, use
git push origin HEAD:pytorchbot/temp-branch-cpp
To push to the branch of the same name on the remote, use
git push origin HEAD
```
just checked the settings, master of pytorch/cppdocs does not have easy cla as a required check, so we don't need the temp branch
Pull Request resolved: https://github.com/pytorch/pytorch/pull/87614
Approved by: https://github.com/huydhn
