Merge branch 'ma/doc-pack-format-varint-for-sizes' into maint

Doc update. * ma/doc-pack-format-varint-for-sizes: pack-format.txt: document sizes at start of delta data

Junio C Hamano committed Feb 8, 2021 at 14:05 UTC 71e83b2e7da61f699f4405233cc20ebf9cb7c66e

No changes.