Merge branch 'ls/filter-process' into maint

Doc update. * ls/filter-process: t0021: fix flaky test docs: warn about possible '=' in clean/smudge filter process values

Junio C Hamano committed Jan 17, 2017 at 15:19 UTC d4a682d42f227be74c49d96eca9b86e35236f7a3

No changes.