Merge branch 'jc/grep-patterntype-default-doc'

Doc update. * jc/grep-patterntype-default-doc: grep: clarify what `grep.patternType=default` means

Junio C Hamano committed Dec 21, 2021 at 15:03 UTC 3770c21be99a1e387794ec21e9bfeb3c640376b6

No changes.