Update param docs for createExtremum. [ci skip]

lodash.src.js

@@ -3451,9 +3451,8 @@
      * Creates a `_.max` or `_.min` function.
      *
      * @private
-     * @param {Function} arrayFunc The function to get the extremum value from an array.
-     * @param {boolean} [isMin] Specify returning the minimum, instead of the maximum,
-     *  extremum value.
+     * @param {Function} comparator The function used to compare values.
+     * @param {*} exValue The initial extremum value.
      * @returns {Function} Returns the new extremum function.
      */
     function createExtremum(comparator, exValue) {