Re-fix rev-list-options documentation

18a2197e (Documentation: rev-list-options: Fix -g paragraph formatting,
2008-08-10) introduced the third paragraph that is continued, but it seems
to confuse docbook toolchain on FC9 machines.
Signed-off-by: NJunio C Hamano <gitster@pobox.com>

Documentation/rev-list-options.txt

@@ -263,8 +263,7 @@ used in the output.  When the starting commit is specified as
 'commit@\{now}', output also uses 'commit@\{timestamp}' notation
 instead.  Under '\--pretty=oneline', the commit message is
 prefixed with this information on the same line.
-+
-Cannot be combined with '\--reverse'.
+This option cannot be combined with '\--reverse'.
 See also linkgit:git-reflog[1].
 
 --merge::