Add docs for split out functions. [ci skip]

lodash.js

@@ -6146,7 +6146,7 @@
 
     /**
      * Sets the `toString` method of `wrapper` to mimic the source of `ref`
-     * with wrapper details added to a comment at the top of the source body.
+     * with wrapper details in a comment at the top of the source body.
      *
      * @private
      * @param {Function} wrapper The function to modify.
@@ -6163,11 +6163,26 @@
       });
     };
 
+    /**
+     * Extracts the wrapper details from the `source` body comment.
+     *
+     * @private
+     * @param {string} source The source to inspect.
+     * @returns {Array} Returns the wrapper details.
+     */
     function getWrapDetails(source) {
       var match = source.match(reWrapDetails);
       return match ? match[1].split(reSplitDetails) : [];
     }
 
+    /**
+     * Inserts the wrapper `details` in a comment at the top of the `source` body.
+     *
+     * @private
+     * @param {string} source The source to modify.
+     * @returns {Array} details The details to insert.
+     * @returns {string} Returns the modified source.
+     */
     function insertWrapDetails(source, details) {
       var length = details.length,
           lastIndex = length - 1;
@@ -6177,6 +6192,14 @@
       return source.replace(reWrapComment, '{\n/* [wrapped with ' + details + '] */\n');
     }
 
+    /**
+     * Updates the wrapper `details` base on the `bitmask` flags.
+     *
+     * @private
+     * @returns {Array} details The details to insert.
+     * @param {number} bitmask The bitmask flags. See `createWrap` for more details.
+     * @returns {Array} Returns `details`.
+     */
     function updateWrapDetails(details, bitmask) {
       arrayEach(wrapFlags, function(pair) {
         var value = '_.' + pair[0];