Remove references to _.

lowerFirst.js

@@ -4,17 +4,16 @@ import createCaseFirst from './_createCaseFirst.js';
  * Converts the first character of `string` to lower case.
  *
  * @static
- * @memberOf _
  * @since 4.0.0
  * @category String
  * @param {string} [string=''] The string to convert.
  * @returns {string} Returns the converted string.
  * @example
  *
- * _.lowerFirst('Fred');
+ * lowerFirst('Fred');
  * // => 'fred'
  *
- * _.lowerFirst('FRED');
+ * lowerFirst('FRED');
  * // => 'fRED'
  */
 const lowerFirst = createCaseFirst('toLowerCase');