Merge branch 'hn/branch-push-slip-advice'

When 'git push origin/main' or 'git branch origin main' is run, the
command is now recognized as a potential typo, and advice has been
added to offer a typo fix.

* hn/branch-push-slip-advice:
  push: suggest <remote> <branch> for a slash slip
  branch: suggest <remote>/<branch> on upstream slip

diff --cc Documentation/config/advice.adoc
Simple merge