app_lua: documented rpc app_lua.api_list command

src/modules/app_lua/doc/app_lua_admin.xml

@@ -405,6 +405,27 @@ if(!lua_runstring("sr.log([[err]], [[----------- Hello World from $fU\n]])"))
 			<programlisting  format="linespecific">
 ...
     &kamcmd; app_lua.reload 0
+...
+            </programlisting>
+        </section>
+       <section id="app_lua.r.api_list">
+            <title>
+            <function moreinfo="none">app_lua.api_list</function>
+            </title>
+            <para>
+			Lists the exported KEMI functions that can be used inside Lua
+			scripts.
+            </para>
+            <para>
+            Name: <emphasis>app_lua.api_list</emphasis>
+            </para>
+            <para>Parameters: <emphasis>none</emphasis></para>
+            <para>
+            Example:
+            </para>
+            <programlisting  format="linespecific">
+...
+    &kamcmd; app_lua.api_list
 ...
             </programlisting>
         </section>