Clarify _.isEmpty docs. [ci skip]

lodash.js

@@ -9781,9 +9781,9 @@
     }
 
     /**
-     * Checks if `value` is empty. A value is considered empty unless it's an
+     * Checks if `value` is an empty collection or object. A value is considered
-     * `arguments` object, array, string, or jQuery-like collection with a length
+     * empty if it's an `arguments` object, array, string, or jQuery-like collection
-     * greater than `0` or an object with own enumerable properties.
+     * with a length of `0` or has no own enumerable properties.
      *
      * @static
      * @memberOf _