Fix eslint errors.

lib/elements/dom-bind.js

@@ -62,6 +62,7 @@ export class DomBind extends domBindBase {
     this.__children = null;
   }
 
+  /* eslint-disable no-unused-vars */
   /**
    * @override
    * @param {string} name Name of attribute that changed

lib/mixins/property-effects.js

@@ -1154,7 +1154,7 @@ export const PropertyEffects = dedupingMixin(superClass => {
     }
 
     /**
-     * @return {!Object<string, string>}
+     * @return {!Object<string, string>} Effect prototype property name map.
      */
     get PROPERTY_EFFECT_TYPES() {
       return TYPES;