Modify docblock for initialize()

Author: andrewimm

src/Parse.js

@@ -25,7 +25,7 @@ var Parse = {
    * You can get your keys from the Data Browser on parse.com.
    * @method initialize
    * @param {String} applicationId Your Parse Application ID.
-   * @param {String} javaScriptKey Your Parse JavaScript Key.
+   * @param {String} javaScriptKey (optional) Your Parse JavaScript Key (Not needed for parse-server)
    * @param {String} masterKey (optional) Your Parse Master Key. (Node.js only!)
    * @static
    */