Update documentation for DIALEDTIME and ANSWEREDTIME variables.

(closes issue #14566)
Reported by: klaus3000
Patches:
      ANSWEREDTIME-1.4-patch.txt uploaded by klaus3000 (license 65)
      ANSWEREDTIME-trunk-patch.txt uploaded by klaus3000 (license 65)


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@179057 65c4cc65-6c06-0410-ace0-fbb531ad65f3

doc/tex/channelvariables.tex

@@ -949,8 +949,8 @@ ${AGENTEXTEN}        * Extension for logged in agent
 \begin{verbatim}
 ${DIALEDPEERNAME}     * Dialed peer name
 ${DIALEDPEERNUMBER}   * Dialed peer number
-${DIALEDTIME}         * Time for the call (seconds)
-${ANSWEREDTIME}       * Time from dial to answer (seconds)
+${DIALEDTIME}         * Time for the call (seconds). Is only set if call was answered.
+${ANSWEREDTIME}       * Time from answer to hangup (seconds)
 ${DIALSTATUS}         * Status of the call, one of:
                         (CHANUNAVAIL | CONGESTION | BUSY | NOANSWER
                         | ANSWER | CANCEL | DONTCALL | TORTURE)