Clarify syntax and role of git-add in status output
Clarify syntax and role of git-add in status output

This uses the actual (simplified) synopsis line from the git-add man page and
advertises its incremental nature.

Signed-off-by: Jürgen Rühle <1cc07504556e9c6efca36b65c48ede9e75a72cdd@online.de>
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