fix: put php opening tag inside region tag

Author: bshaffer

functions/helloworld_http/index.php

@@ -1,21 +1,20 @@
-
-/**
- * Copyright 2020 Google LLC.
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *     http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
+
 
 // [START functions_helloworld_http]
+
 
 use Psr\Http\Message\ServerRequestInterface;