I added a sentence to clarify why - and ' ' are ignored in patterns

as per bug 14076. Leif says he'll put some stuff about it in the
extensions.conf sample, etc.



git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/1.4@164634 65c4cc65-6c06-0410-ace0-fbb531ad65f3

main/pbx.c

@@ -595,7 +595,8 @@ static void pbx_destroy(struct ast_pbx *p)
  * Special characters used in patterns:
  *	'_'	underscore is the leading character of a pattern.
  *		In other position it is treated as a regular char.
- *	' ' '-'	space and '-' are separator and ignored.
+ *	' ' '-'	space and '-' are separator and ignored. Why? so
+ *	        patterns like NXX-XXX-XXXX or NXX XXX XXXX will work.
  *	.	one or more of any character. Only allowed at the end of
  *		a pattern.
  *	!	zero or more of anything. Also impacts the result of CANMATCH