i18n: fix command template placeholder format

Signed-off-by: Jean-Noël Avila <jn.avila@free.fr>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

Documentation/git-revert.txt

diff --git a/Documentation/git-revert.txt b/Documentation/git-revert.txt
index 0105a54..67c2762 100644
--- a/Documentation/git-revert.txt
+++ b/Documentation/git-revert.txt
@@ -8,7 +8,7 @@
 SYNOPSIS
 --------
 [verse]
-'git revert' [--[no-]edit] [-n] [-m parent-number] [-s] [-S[<keyid>]] <commit>...
+'git revert' [--[no-]edit] [-n] [-m <parent-number>] [-s] [-S[<keyid>]] <commit>...
 'git revert' (--continue | --skip | --abort | --quit)
 
 DESCRIPTION

builtin/revert.c

diff --git a/builtin/revert.c b/builtin/revert.c
index ee32c71..6a9b550 100644
--- a/builtin/revert.c
+++ b/builtin/revert.c
@@ -21,7 +21,7 @@
  */
 
 static const char * const revert_usage[] = {
-	N_("git revert [--[no-]edit] [-n] [-m parent-number] [-s] [-S[<keyid>]] <commit>..."),
+	N_("git revert [--[no-]edit] [-n] [-m <parent-number>] [-s] [-S[<keyid>]] <commit>..."),
 	N_("git revert (--continue | --skip | --abort | --quit)"),
 	NULL
 };