Make it clear that caller ID in sip.conf is used only on incoming calls (inspired by bug #6183)

git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@8554 65c4cc65-6c06-0410-ace0-fbb531ad65f3

configs/sip.conf.sample

@@ -342,6 +342,7 @@ srvlookup=yes			; Enable DNS SRV lookups on outbound calls
 ;type=friend 			
 ;context=from-sip		; Where to start in the dialplan when this phone calls
 ;callerid=John Doe <1234>	; Full caller ID, to override the phones config
+				; on incoming calls to Asterisk
 ;host=192.168.0.23		; we have a static but private IP address
 				; No registration allowed
 ;nat=no				; there is not NAT between phone and Asterisk