doc txt & -h consistency: make "rerere" consistent

For "rerere" say "pathspec" consistently, and list the subcommands in
the order that they're discussed in the "COMMANDS" section of the
documentation.

Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

Documentation/git-rerere.txt

@@ -8,7 +8,7 @@ git-rerere - Reuse recorded resolution of conflicted merges
 SYNOPSIS
 --------
 [verse]
-'git rerere' [clear | forget <pathspec> | diff | remaining | status | gc]
+'git rerere' [clear | forget <pathspec>... | diff | status | remaining | gc]
 
 DESCRIPTION
 -----------

builtin/rerere.c

@@ -10,7 +10,7 @@
 #include "pathspec.h"
 
 static const char * const rerere_usage[] = {
-	N_("git rerere [clear | forget <pathspec>... | status | remaining | diff | gc]"),
+	N_("git rerere [clear | forget <pathspec>... | diff | status | remaining | gc]"),
 	NULL,
 };