Formatting Fixes

- Fixed Imports
- Fixed Formatting
- Added Missing Documentation

sample/billing/UpdatePlan.php

@@ -13,10 +13,11 @@
 /** @var Plan $createdPlan */
 $createdPlan = require 'CreatePlan.php';
 
-use PayPal\Api\Plan;
-use PayPal\Api\PatchRequest;
 use PayPal\Api\Patch;
+use PayPal\Api\PatchRequest;
+use PayPal\Api\Plan;
 use PayPal\Common\PayPalModel;
+
 try {
     $patch = new Patch();