app_lua: note about submodule sr.auth

modules/app_lua/README

@@ -127,6 +127,7 @@ modparam("lua", "load", "/usr/local/etc/kamailio/lua/myscript.lua")
 
    Use this function to register optional SIP Router submodules to Lua.
    Available submodules are:
+     * auth - register functions from auth module under 'sr.auth'.
      * rr - register functions from rr module under 'sr.rr'.
      * sqlops - register functions from sqlops module under 'sr.sqlops'.
      * sl - register functions from sl module under 'sr.sl'.

modules/app_lua/doc/app_lua_admin.xml

@@ -109,6 +109,12 @@ modparam("lua", "load", "/usr/local/etc/kamailio/lua/myscript.lua")
 			to Lua. Available submodules are:
 	    </para>
 	    	<itemizedlist>
+		    <listitem>
+			<para>
+				<emphasis>auth</emphasis> - register functions from auth module
+				under 'sr.auth'.
+			</para>
+		    </listitem>
 		    <listitem>
 			<para>
 				<emphasis>rr</emphasis> - register functions from rr module