Documentation: remove a redundant elaboration

The comment in parentheses is wrong, as one has to leave out both the
colon and <dst>. This situation is covered by the section a few lines
down:

  A parameter <ref> without a colon pushes the <ref> from the source
  repository to the destination repository under the same name.

So, just remove the parentheses.

Signed-off-by: Anders Melchiorsen <mail@cup.kalibalik.dk>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

Documentation/git-push.txt

@@ -44,8 +44,7 @@ tip of `master` branch); see linkgit:git-rev-parse[1]) that you
 want to push.  The <dst> side represents the destination location.
 +
 The local ref that matches <src> is used
-to fast forward the remote ref that matches <dst> (or, if no <dst> was
-specified, the same ref that <src> referred to locally).  If
+to fast forward the remote ref that matches <dst>.  If
 the optional leading plus `+` is used, the remote ref is updated
 even if it does not result in a fast forward update.
 +