Merge branch 'ps/update-ref-trans-hook-doc'

Doc update. * ps/update-ref-trans-hook-doc: githooks.txt: clarify documentation on reference-transaction hook githooks.txt: replace mentions of SHA-1 specific properties

Junio C Hamano committed Mar 22, 2021 at 14:00 UTC 20adca90064fe4e8b5fcff312e74ff2e1a407bd2

No changes.