cvs-migration: improved section titles, better push/commit explanation
cvs-migration: improved section titles, better push/commit explanation

Rename the section titles to make the "how-to" content of the section
obvious.  Also clarify that changes have to be commited before they can
be pushed.

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