commit: fixup misplacement of --no-post-rewrite description

In e858af6d (commit: document a couple of options) the description of the
--no-post-rewrite option was put inside the paragraph for the --amend
option.  Move it down after the paragraph.
Signed-off-by: NAndreas Schwab <schwab@linux-m68k.org>
Signed-off-by: NJeff King <peff@peff.net>

Documentation/git-commit.txt

@@ -193,10 +193,6 @@ OPTIONS
 	current tip -- if it was a merge, it will have the parents of
 	the current tip as parents -- so the current top commit is
 	discarded.
-
---no-post-rewrite::
-	Bypass the post-rewrite hook.
-
 +
 --
 It is a rough equivalent for:
@@ -213,6 +209,9 @@ You should understand the implications of rewriting history if you
 amend a commit that has already been published.  (See the "RECOVERING
 FROM UPSTREAM REBASE" section in linkgit:git-rebase[1].)
 
+--no-post-rewrite::
+	Bypass the post-rewrite hook.
+
 -i::
 --include::
 	Before making a commit out of staged contents so far,