Documentation (docblock) fixes.
Fixed documentation for ORM\Event and ORM\Id
Fixed documentation for ORM\Internal
Fixed documentation for ORM\Mapping
Fixed documentation for ORM\Persisters
Fixed English mistakes
Fixed documentation for ORM\Proxy
Fixed documentation for Doctrine\ORM\Query\AST\Functions
Fixed documentation for Doctrine\ORM\Query\AST
Fixed documentation for Doctrine\ORM\Query\Exec
Fixed documentation for Doctrine\ORM\Query\Expr and Doctrine\ORM\Query\Filter
Fixed documentation for Doctrine\ORM\Query
Fixed unused 'use' statements.
Fixed missed documentation issues in Doctrine\ORM
Fixed documentation for Doctrine\ORM\Tools
Fixed documentation for Doctrine\ORM\Tools\Console
Fixed documentation for Doctrine\ORM\Tools\Event
Fixed documentation for Doctrine\ORM\Tools\Export
Fixed documentation for Doctrine\ORM\Tools\Pagination
Fixed documentation for Doctrine\Tests\DbalTypes
Fixed documentation for Doctrine\Tests\Mocks