contrib/examples/git-remote.perl: use a lowercase "usage:" string

Make the usage string consistent with Git.

Signed-off-by: David Aguilar <davvid@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

Author: davvid

contrib/examples/git-remote.perl

@@ -380,7 +380,7 @@ sub add_usage {
 		}
 	}
 	if ($i >= @ARGV) {
-		print STDERR "Usage: git remote show <remote>\n";
+		print STDERR "usage: git remote show <remote>\n";
 		exit(1);
 	}
 	my $status = 0;
@@ -410,7 +410,7 @@ sub add_usage {
 		}
 	}
 	if ($i >= @ARGV) {
-		print STDERR "Usage: git remote prune <remote>\n";
+		print STDERR "usage: git remote prune <remote>\n";
 		exit(1);
 	}
 	my $status = 0;
@@ -458,13 +458,13 @@ sub add_usage {
 }
 elsif ($ARGV[0] eq 'rm') {
 	if (@ARGV <= 1) {
-		print STDERR "Usage: git remote rm <remote>\n";
+		print STDERR "usage: git remote rm <remote>\n";
 		exit(1);
 	}
 	exit(rm_remote($ARGV[1]));
 }
 else {
-	print STDERR "Usage: git remote\n";
+	print STDERR "usage: git remote\n";
 	print STDERR "       git remote add <name> <url>\n";
 	print STDERR "       git remote rm <name>\n";
 	print STDERR "       git remote show <name>\n";