Bypass the rendering differences in AsciiDoctor.

AsciiDoctor have different understanding of [verse] with asciidoc, causing some
rendering differences. To get similar result with asciidoc, we use something
else instead of [verse] now.

Screenshots:
before:
http://imgur.com/JKMdBiv
after:
http://imgur.com/yFVvVac

Change-Id: I14e84f0e998e1e87b633681e8028ad657bde07e4
diff --git a/Documentation/cmd-ls-groups.txt b/Documentation/cmd-ls-groups.txt
index 0713947..c79dbdc 100644
--- a/Documentation/cmd-ls-groups.txt
+++ b/Documentation/cmd-ls-groups.txt
@@ -7,7 +7,7 @@
 
 SYNOPSIS
 --------
-[verse]
+--
 'ssh' -p <port> <host> 'gerrit ls-groups'
   [--project <NAME> | -p <NAME>]
   [--user <NAME> | -u <NAME>]
@@ -16,6 +16,7 @@
   [--type {internal | system}]
   [-q <GROUP>]
   [--verbose | -v]
+--
 
 DESCRIPTION
 -----------