Merge branch 'gm/signature-format-doc'

Doc update. * gm/signature-format-doc: signature-format.txt: note SSH and X.509 signature delimiters

Junio C Hamano committed Mar 6, 2023 at 21:51 UTC 9a4e18b7010f4f0136e71af3f701d10688b98a73

No changes.