Modifications to PHP Opencloud

These changes update the formatting to fully match PSR-2, and also update the docblocks to be more descriptive.

I also updated the `CertificateMappings::updateJson()` method to be more efficient. Compare to `LoadBalancer::updateJson()`.
The comment about the parameter in the docblock should clarify what ID you're looking for. But if you think it should revert back to `$certificateMappingId`, I'll do it.