treewide: correct several "up-to-date" to "up to date"

Follow the Oxford style, which says to use "up-to-date" before the noun,
but "up to date" after it. Don't change plumbing (specifically
send-pack.c, but transport.c (git push) also has the same string).

This was produced by grepping for "up-to-date" and "up to date". It
turned out we only had to edit in one direction, removing the hyphens.

Fix a typo in Documentation/git-diff-index.txt while we're there.

Reported-by: Jeffrey Manian <jeffrey.manian@gmail.com>
Reported-by: STEVEN WHITE <stevencharleswhitevoices@gmail.com>
Signed-off-by: Martin Ågren <martin.agren@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

templates/hooks--pre-rebase.sample

@@ -58,7 +58,7 @@ then
 	not_in_topic=`git rev-list "^$topic" master`
 	if test -z "$not_in_topic"
 	then
-		echo >&2 "$topic is already up-to-date with master"
+		echo >&2 "$topic is already up to date with master"
 		exit 1 ;# we could allow it, but there is no point.
 	else
 		exit 0