branch (doc): -m/-c copies config and reflog

The description section for the command mentions config and reflog
are moved or copied by these options, but the description for these
options did not.  Make them match.

Signed-off-by: Junio C Hamano <gitster@pobox.com>

Documentation/git-branch.txt

@@ -125,14 +125,14 @@ OPTIONS
 
 -m::
 --move::
-	Move/rename a branch and the corresponding reflog.
+	Move/rename a branch, together with its config and reflog.
 
 -M::
 	Shortcut for `--move --force`.
 
 -c::
 --copy::
-	Copy a branch and the corresponding reflog.
+	Copy a branch, together with its config and reflog.
 
 -C::
 	Shortcut for `--copy --force`.