Generated PHP code with incorrect comment formating

[vishwarajanand]

Language: PHP

What did you do? Steps to reproduce the behavior:

1. Go to https://github.com/googleapis/google-cloud-php/pull/6737/files
2. Click on Dataform/src/V1beta1/Client/DataformClient.php
3. Scroll down to setIamPolicy and see the code block over the method, it has missing asterisk sign in comments.

What did you expect to see All comments start with asterisk.

What did you see instead? ref

/**
     * Sets the access control policy on the specified resource. Replaces
    any existing policy.

    Can return `NOT_FOUND`, `INVALID_ARGUMENT`, and `PERMISSION_DENIED`
    errors.
     *
     * The async variant is {@see DataformClient::setIamPolicyAsync()} .
     *

[haberman]

It looks like the code generator is attempting to put an asterisk at the beginning of every line: https://github.com/protocolbuffers/protobuf/blob/758f5cbe19911f313c4185fc5b7a3522f1d6836a/src/google/protobuf/compiler/php/php_generator.cc#L1619-L1627

But for some reason this isn't working. We'd be happy to accept a contribution to fix this.