Merge branch 'jc/doc-commit-header-continuation-line'

Doc update. * jc/doc-commit-header-continuation-line: signature-format.txt: explain and illustrate multi-line headers

Junio C Hamano committed Oct 25, 2021 at 16:07 UTC 97ab03b12a044ded55de68aac160ffb72c951830

No changes.