Merge branch 'sg/git-C-empty-doc' into maint

Doc update. * sg/git-C-empty-doc: Document that 'git -C ""' works and doesn't change directory

Junio C Hamano committed Jul 29, 2019 at 12:38 UTC bcb30d718a1bd2d3c6615d48e80816d1b50ee18f

No changes.