Documentation: prepare to be consistent about "git-" versus "git "

Documentation: prepare to be consistent about "git-" versus "git "

With the dashed forms of git commands not in $(bindir), we have
to change many instances of "git-command" to "git command". Also,
for consistency it is at times appropriate to make the opposite
change. In some cases, the change is not so simple as changing one
character.

This patch gets rid of some of those cases by rewrapping lines.

Signed-off-by: Jonathan Nieder <jrnieder@uchicago.edu>
Signed-off-by: Junio C Hamano <gitster@pobox.com>