Fix the display of documentation for Transfer

Fix the display of documentation for Transfer

This came up while fixing documentation generation for many other cases where
the argument separator was not being displayed properly.  Now that it is
displayed properly, it shows up in the wrong place for Transfer since the '/'
is only required if Tech is present.

(related to issue ASTERISK-18168)
........

Merged revisions 361040 from http://svn.asterisk.org/svn/asterisk/branches/1.8

git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/10@361041 65c4cc65-6c06-0410-ace0-fbb531ad65f3