The -n option stands for --no-summary in git pull

[jes: reworded the description to avoid mentioning 'git-fetch';
 also exclude '-n' conditional on git-pull -- ugly because of
 the missing "else" statement in asciidoc]
Signed-off-by: NMiklos Vajna <vmiklos@frugalware.org>
Signed-off-by: NJohannes Schindelin <johannes.schindelin@gmx.de>
Signed-off-by: NJunio C Hamano <gitster@pobox.com>