Correct reference to Radius library

THanks Philippe - Greetings from Lisboa, Portugal


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@58901 65c4cc65-6c06-0410-ace0-fbb531ad65f3

cdr/cdr_radius.c

@@ -20,7 +20,7 @@
  *
  * \brief RADIUS CDR Support
  * \author Philippe Sultan
- * \extref FreeRadius http://www.freeradius.org/
+ * \extref The Radius Client Library - http://developer.berlios.de/projects/radiusclient-ng/
  * 
  * \arg See also \ref AstCDR
  * \ingroup cdr_drivers