Merge branch 'sg/index-format-doc-update' into maint

Docfix. source: <20220718085640.7395-1-szeder.dev@gmail.com> * sg/index-format-doc-update: index-format.txt: remove outdated list of supported extensions

Junio C Hamano committed Aug 5, 2022 at 15:51 UTC 19177019ed86038a559e0e9d8dc1b2114f13e195

No changes.