Clarify docs on omitBy predicate params. [ci skip]

lodash.js

@@ -11659,9 +11659,10 @@
     });
 
     /**
-     * The opposite of `_.pickBy`; this method creates an object composed of the
-     * own and inherited enumerable properties of `object` that `predicate`
-     * doesn't return truthy for.
+     * The opposite of `_.pickBy`; this method creates an object composed of
+     * the own and inherited enumerable properties of `object` that `predicate`
+     * doesn't return truthy for. The predicate is invoked with two arguments:
+     * (value, key).
      *
      * @static
      * @memberOf _