Run php-cs-fixer to pass Kokoro test

Author: rsamborski

compute/cloud-client/instances/src/create_instance.php

@@ -86,4 +86,4 @@ function create_instance(
 # [END compute_instances_create]
 
 require_once __DIR__ . '/../../../../testing/sample_helpers.php';
-\Google\Cloud\Samples\execute_sample(__FILE__, __NAMESPACE__, $argv);
+\Google\Cloud\Samples\execute_sample(__FILE__, __NAMESPACE__, $argv);