doc: fix descripion for 'git tag --format'

The '--format=<format>' is now listed in the 'OPTIONS' section, not only
the '<format>' string itself. The description moved up a few paragraphs
because '<format>' is not a standalone paramater but a parameter for the
option '--format'.

Signed-off-by: Andreas Heiduk <asheiduk@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

Documentation/git-tag.txt

@@ -187,6 +187,12 @@ This option is only applicable when listing tags without annotation lines.
 	`--create-reflog`, but currently does not negate the setting of
 	`core.logAllRefUpdates`.
 
+--format=<format>::
+	A string that interpolates `%(fieldname)` from a tag ref being shown
+	and the object it points at.  The format is the same as
+	that of linkgit:git-for-each-ref[1].  When unspecified,
+	defaults to `%(refname:strip=2)`.
+
 <tagname>::
 	The name of the tag to create, delete, or describe.
 	The new tag name must pass all checks defined by
@@ -198,12 +204,6 @@ This option is only applicable when listing tags without annotation lines.
 	The object that the new tag will refer to, usually a commit.
 	Defaults to HEAD.
 
-<format>::
-	A string that interpolates `%(fieldname)` from a tag ref being shown
-	and the object it points at.  The format is the same as
-	that of linkgit:git-for-each-ref[1].  When unspecified,
-	defaults to `%(refname:strip=2)`.
-
 CONFIGURATION
 -------------
 By default, 'git tag' in sign-with-default mode (-s) will use your