Merge branch 'jh/index-v2-doc-on-fsmn'

Doc update. * jh/index-v2-doc-on-fsmn: index-format.txt: document v2 format of file system monitor extension

Junio C Hamano committed Dec 17, 2020 at 15:06 UTC 7bceb83bfe0f857c76ce34e481cbc923eabb9bac

No changes.