Deprecate a single parameter

[shyim]

Hey,

Google Cloud Storage has deprecated a single parameter: https://github.com/googleapis/google-cloud-php-storage/blob/4b81b682f6b1517c0c5f6152b2980195d23c1cef/src/StorageClient.php#L100

Now the entire constructor is marked as deprecated for this extension. Anything we could do here properly instead of ignoring at all?

[ondrejmirtes]

This is a question more for phpdoc-parser rather than here.