Remove references to _.

toUpper.js

@@ -5,20 +5,19 @@ import toString from './toString.js';
  * [String#toUpperCase](https://mdn.io/toUpperCase).
  *
  * @static
- * @memberOf _
  * @since 4.0.0
  * @category String
  * @param {string} [string=''] The string to convert.
  * @returns {string} Returns the upper cased string.
  * @example
  *
- * _.toUpper('--foo-bar--');
+ * toUpper('--foo-bar--');
  * // => '--FOO-BAR--'
  *
- * _.toUpper('fooBar');
+ * toUpper('fooBar');
  * // => 'FOOBAR'
  *
- * _.toUpper('__foo_bar__');
+ * toUpper('__foo_bar__');
  * // => '__FOO_BAR__'
  */
 function toUpper(value) {