Address linting issues.

lib/legacy/class.html

@@ -192,6 +192,7 @@ subject to an additional IP rights grant found at http://polymer.github.io/PATEN
     /**
      * @param {!PolymerInit} info Polymer info object
      * @param {function(new:HTMLElement)} Base base class to extend with info object
+     * @param {Object} behaviors behaviors to copy into the element
      * @return {function(new:HTMLElement)} Generated class
      * @suppress {checkTypes}
      * @private
@@ -498,6 +499,8 @@ subject to an additional IP rights grant found at http://polymer.github.io/PATEN
      *
      * @param {!PolymerInit} info Object containing Polymer metadata and functions
      *   to become class methods.
+     * @param {function(T):T} mixin Optional mixin to apply to legacy base class
+     *   before extending with Polymer metaprogramming.
      * @return {function(new:HTMLElement)} Generated class
      * @memberof Polymer
      */