Document that 'git -C ""' works and doesn't change directory
authorSZEDER Gábor <szeder.dev@gmail.com>
Sat, 29 Jun 2019 08:24:57 +0000 (10:24 +0200)
committerJunio C Hamano <gitster@pobox.com>
Mon, 1 Jul 2019 17:42:49 +0000 (10:42 -0700)
It's been behaving so since 6a536e2076 (git: treat "git -C '<path>'"
as a no-op when <path> is empty, 2015-03-06).

Signed-off-by: SZEDER Gábor <szeder.dev@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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