QueryBuilder: added phpdoc
QueryBuilder: added phpdoc

dyamon-cz/nextras-dbal,nextras/dbal,Mikulas/dbal,jasir/dbal,nextras/dbal,nextras/dbal,jasir/dbal,Mikulas/dbal,Mikulas/dbal,dyamon-cz/nextras-dbal,dyamon-cz/nextras-dbal,jasir/dbal