app_meetme: Document that 'p' option will continue in dialplan.

(closes issue AST-991)
Reported by John Bigelow
........

Merged revisions 372765 from http://svn.asterisk.org/svn/asterisk/branches/1.8


git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/10@372767 65c4cc65-6c06-0410-ace0-fbb531ad65f3

apps/app_meetme.c

@@ -144,7 +144,8 @@ ASTERISK_FILE_VERSION(__FILE__, "$Revision$")
 					</option>
 					<option name="p" hasparams="optional">
 						<para>Allow user to exit the conference by pressing <literal>#</literal> (default)
-						or any of the defined keys.  The key used is set to channel variable
+						or any of the defined keys. Dial plan execution will continue at the next
+						priority following MeetMe. The key used is set to channel variable
 						<variable>MEETME_EXIT_KEY</variable>.</para>
 						<argument name="keys" required="true" />
 						<note>