Remove references to _.

mapKeys.js

@@ -2,22 +2,21 @@ import baseAssignValue from './_baseAssignValue.js';
 import baseForOwn from './_baseForOwn.js';
 
 /**
- * The opposite of `_.mapValues`; this method creates an object with the
+ * The opposite of `mapValues`; this method creates an object with the
  * same values as `object` and keys generated by running each own enumerable
  * string keyed property of `object` thru `iteratee`. The iteratee is invoked
  * with three arguments: (value, key, object).
  *
  * @static
- * @memberOf _
  * @since 3.8.0
  * @category Object
  * @param {Object} object The object to iterate over.
  * @param {Function} iteratee The function invoked per iteration.
  * @returns {Object} Returns the new mapped object.
- * @see _.mapValues
+ * @see mapValues
  * @example
  *
- * _.mapKeys({ 'a': 1, 'b': 2 }, function(value, key) {
+ * mapKeys({ 'a': 1, 'b': 2 }, function(value, key) {
  *   return key + value;
  * });
  * // => { 'a1': 1, 'b2': 2 }