Fill out inline documentation for the `__call()` magic method added to the `wp_xmlrpc_server` class in [28515].

See #22234 and #28885.


git-svn-id: https://develop.svn.wordpress.org/trunk@29161 602fd350-edb4-49c9-b593-d223f7449a82

src/wp-includes/class-wp-xmlrpc-server.php

@@ -145,9 +145,11 @@ class wp_xmlrpc_server extends IXR_Server {
 	 * Make private/protected methods readable for backwards compatibility
 	 *
 	 * @since 4.0.0
-	 * @param string $name
-	 * @param array $arguments
-	 * @return mixed
+	 * @access public
+	 *
+	 * @param callable $name      Method to call.
+	 * @param array    $arguments Arguments to pass when calling.
+	 * @return mixed|bool Return value of the callback, false otherwise.
 	 */
 	public function __call( $name, $arguments ) {
 		return call_user_func_array( array( $this, $name ), $arguments );