When possible, references to protobuf messages should be rendered as links to the generated class

[dwsupplee]

For more context: https://github.com/GoogleCloudPlatform/google-cloud-php/pull/1113#discussion_r198255098

[vishwarajanand]

This still exists in LongRunning client, but I cannot trace how this was fixed. cc:@bshaffer

[bshaffer]

I don't understand the request here, and the context link is not helpful either. Can you explain more what the objective is here?

[bshaffer]

I think this is outdated. We now use @see tags, which are helpful for IDEs and also for our documentation at cloud.google.com/php/docs/reference. I do not think there's anything else that needs to be done, and we can close this.