Add a Notice to config about realm default value is the domain name

ChangeLog

@@ -2,6 +2,9 @@
 Version 4.5.0.8 'dan Eider':
 	- Spelling fixes.
 	- Add a warning if --lt-cred-mech and --use-auth-secret both presents.
+	- Revert "Add the realm parameter in the example config file (by Domenico)"
+	- Fix for Verbose config file option -v cli option overridea
+	- Add a Notice to config about realm default value is the domain name.
 
 12/10/2017 Oleg Moskalenko <mom040267@gmail.com>
 Version 4.5.0.7 'dan Eider':

examples/etc/turnserver.conf

@@ -306,6 +306,9 @@
 # and the userdb file). Must be used with long-term credentials 
 # mechanism or with TURN REST API.
 #
+# Note: If default realm is not specified at all, then realm falls back to the host domain name.
+#       If domain name is empty string, or '(None)', then it is initialized to am empty string.
+#
 #realm=mycompany.org
 
 # The flag that sets the origin consistency