Documentation: chan_sip doesn't support WS or WSS in outbound register.

* In sip.conf.sample fix sentence where we said that WS or WSS are supported
   transports for use in an outbound register definition. They are not
   supported in that case.

ASTERISK-24853 #close
Reported by: PSDK

Change-Id: I3d698bc6302b9d00a0a995b5c4ad9a42d69b48ca

configs/sip.conf.sample

@@ -789,7 +789,7 @@ srvlookup=yes                   ; Enable DNS SRV lookups on outbound calls
 ;
 ;register => tls://username:xxxxxx@sip-tls-proxy.example.org
 ;
-;    The 'transport' part defaults to 'udp' but may also be 'tcp', 'tls', 'ws', or 'wss'.
+;    The 'transport' part defaults to 'udp' but may also be 'tcp' or 'tls'.
 ;    Using 'udp://' explicitly is also useful in case the username part
 ;    contains a '/' ('user/name').