Rearrange git-format-patch synopsis to improve clarity.

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

Documentation/git-format-patch.txt

@@ -9,9 +9,10 @@ git-format-patch - Prepare patches for e-mail submission
 SYNOPSIS
 --------
 [verse]
-'git-format-patch' [-n | -N | -k] [-o <dir> | --stdout] [--thread]
+'git-format-patch' [-k] [-o <dir> | --stdout] [--thread]
                    [--attach[=<boundary>] | --inline[=<boundary>]]
                    [-s | --signoff] [<common diff options>]
+                   [-n | --numbered | -N | --no-numbered]
                    [--start-number <n>] [--numbered-files]
                    [--in-reply-to=Message-Id] [--suffix=.<sfx>]
                    [--ignore-if-in-upstream]