Fix formatting in git-config(1)

This fixes two formatting bugs in the git-config documentation:

- in the column.ui entry don't indent the last paragraph so that it isn't
  formatted as a literal paragraph
- in the push.default entry separate the last paragraph from the
  nested list.

Signed-off-by: Andreas Schwab <schwab@linux-m68k.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

Documentation/config.txt

@@ -1721,6 +1721,7 @@ push.default::
 	no refspec is implied by any of the options given on the command
 	line. Possible values are:
 +
+--
 * `nothing` - do not push anything.
 * `matching` - push all branches having the same name in both ends.
   This is for those who prepare all the branches into a publishable
@@ -1740,6 +1741,7 @@ push.default::
   option and is well-suited for beginners. It will become the default
   in Git 2.0.
 * `current` - push the current branch to a branch of the same name.
+--
 +
 The `simple`, `current` and `upstream` modes are for those who want to
 push out a single branch after finishing work, even when the other