Document long options '--message=<msg>' and '--no-commit'

Document that '--message=<msg>' is long version of '-m <msg>' in
git-commit, and that '--no-checkout' is long version of '-n' in
git-clone.
Signed-off-by: NJakub Narebski <jnareb@gmail.com>
Signed-off-by: NJunio C Hamano <gitster@pobox.com>

Documentation/git-clone.txt

@@ -64,6 +64,7 @@ OPTIONS
 	Operate quietly.  This flag is passed to "rsync" and
 	"git-fetch-pack" commands when given.
 
+--no-checkout::
 -n::
 	No checkout of HEAD is performed after the clone is complete.
 

Documentation/git-commit.txt

@@ -71,7 +71,7 @@ OPTIONS
 	Override the author name used in the commit.  Use
 	`A U Thor <author@example.com>` format.
 
--m <msg>::
+-m <msg>|--message=<msg>::
 	Use the given <msg> as the commit message.
 
 -s|--signoff::