Missing class documentation for RdKafka\Metadata\Topic and RdKafka\Metadata\Broker

[Arkemlar]

These classes mentioned in https://arnaud.le-blanc.net/php-rdkafka-doc/phpdoc/rdkafka-metadata.getbrokers.html and in https://arnaud.le-blanc.net/php-rdkafka-doc/phpdoc/rdkafka-metadata.gettopics.html but not documented.