Fix some typos in the voicemail config (bug #3384)

git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@4852 65c4cc65-6c06-0410-ace0-fbb531ad65f3

configs/voicemail.conf.sample

@@ -57,8 +57,10 @@ maxlogins=3
 ;
 ; Note: The emailbody config row can be up to 512 characters due to a limitation in 
 ;       asterisk config files.
-;emailsubject=New VM (${VM_MSGNUM}) - ${VM_DUR} long in mailbox ${VM_MAILBOX} from ${VM_CALLERID} 
-;emailbody=Dear ${VM_NAME}:\n\n\tjust wanted to let you know you were just left a ${VM_DUR} long message (number ${VM_MSGNUM})\nin mailbox ${VM_MAILBOX} from ${VM_CALLERID}, on ${VM_DATE} so you might\nwant to check it when you get a chance.  Thanks!\n\n\t\t\t\t--Asterisk\n
+;emailsubject=[PBX]: New message ${VM_MSGNUM} in mailbox ${VM_MAILBOX}
+; The following definition is very close to the default, but the default shows just 
+; the CIDNAME, if it is not null, else just the CIDNUM, or "an unknown caller" if they are both null.
+;emailbody=Dear ${VM_NAME}:\n\n\tjust wanted to let you know you were just left a ${VM_DUR} long message (number ${VM_MSGNUM})\nin mailbox ${VM_MAILBOX} from ${VM_CALLERID}, on ${VM_DATE}, so you might\nwant to check it when you get a chance.  Thanks!\n\n\t\t\t\t--Asterisk\n
 
 ;
 ; You can override the default program to send e-mail if you wish, too