Revert "git-commit-tree(1): update synopsis"

This reverts commit d28436736a, which
was done without realizing that the updated command line argument
order was lost by mistake.

Documentation/git-commit-tree.txt

@@ -10,7 +10,7 @@ SYNOPSIS
 --------
 [verse]
 'git commit-tree' <tree> [(-p <parent>)...] < changelog
-'git commit-tree' <tree> [(-p <parent>)...] [(-m <message>)...] [(-F <file>)...]
+'git commit-tree' [(-p <parent>)...] [(-m <message>)...] [(-F <file>)...] <tree>
 
 DESCRIPTION
 -----------