Update firewall_devices.rst

source/firewall/firewall_devices.rst

@@ -30,5 +30,4 @@ Most of the time this setting is set to off or disabled and varies.  Rarely this
 
 
 
-
-.. _Call Block: http://docs.fusionpbx.com/en/latest/firewall/firewall_devices/zyxel_sip_alg.html
+.. _Zyxel: http://docs.fusionpbx.com/en/latest/firewall/firewall_devices/zyxel_sip_alg.html