reflog doc: list real subcommands up-front

Change the "git reflog" documentation to exhaustively list the
subcommands it accepts in the SYNOPSIS, as opposed to leaving that for
a "[verse]" in the DESCRIPTION section. This documentation style was
added in cf39f54efc (git reflog show, 2007-02-08), but isn't how
other commands which take subcommands are documented.

Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

Documentation/git-reflog.txt

@@ -8,14 +8,6 @@ git-reflog - Manage reflog information
 
 SYNOPSIS
 --------
-[verse]
-'git reflog' <subcommand> <options>
-
-DESCRIPTION
------------
-The command takes various subcommands, and different options
-depending on the subcommand:
-
 [verse]
 'git reflog' [show] [<log-options>] [<ref>]
 'git reflog expire' [--expire=<time>] [--expire-unreachable=<time>]
@@ -25,6 +17,10 @@ depending on the subcommand:
 	[--dry-run | -n] [--verbose] <ref>@{<specifier>}...
 'git reflog exists' <ref>
 
+DESCRIPTION
+-----------
+This command manages the information recorded in the reflogs.
+
 Reference logs, or "reflogs", record when the tips of branches and
 other references were updated in the local repository. Reflogs are
 useful in various Git commands, to specify the old value of a
@@ -33,7 +29,8 @@ moves ago", `master@{one.week.ago}` means "where master used to point
 to one week ago in this local repository", and so on. See
 linkgit:gitrevisions[7] for more details.
 
-This command manages the information recorded in the reflogs.
+The command takes various subcommands, and different options
+depending on the subcommand:
 
 The "show" subcommand (which is also the default, in the absence of
 any subcommands) shows the log of the reference provided in the