doc: hooks.txt said post-commit default sends an email, it doesn't
doc: hooks.txt said post-commit default sends an email, it doesn't

The default post-commit hook is actually empty; it is the update hook
that sends an email.  This patch corrects hooks.txt to reflect that.

Signed-off-by: Andy Parkins <70cbb5c3dd4d8b4f73909902fb6e61dc5c3237c1@gmail.com>
Signed-off-by: Junio C Hamano <dc50d1021234060e53ec42a77d526afa2fe07479@cox.net>

destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git