Remove references to _.

isNaN.js

@@ -9,23 +9,22 @@ import isNumber from './isNumber.js';
  * `undefined` and other non-number values.
  *
  * @static
- * @memberOf _
  * @since 0.1.0
  * @category Lang
  * @param {*} value The value to check.
  * @returns {boolean} Returns `true` if `value` is `NaN`, else `false`.
  * @example
  *
- * _.isNaN(NaN);
+ * isNaN(NaN);
  * // => true
  *
- * _.isNaN(new Number(NaN));
+ * isNaN(new Number(NaN));
  * // => true
  *
  * isNaN(undefined);
  * // => true
  *
- * _.isNaN(undefined);
+ * isNaN(undefined);
  * // => false
  */
 function isNaN(value) {