/usr/share/doc/php-doctrine-orm/html/reference/ is in doctrine-orm-doc 2.4.6-1+deb8u1.
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/usr/share/doc/php-doctrine-orm/html/reference/advanced-configuration.html
/usr/share/doc/php-doctrine-orm/html/reference/annotations-reference.html
/usr/share/doc/php-doctrine-orm/html/reference/architecture.html
/usr/share/doc/php-doctrine-orm/html/reference/association-mapping.html
/usr/share/doc/php-doctrine-orm/html/reference/basic-mapping.html
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/usr/share/doc/php-doctrine-orm/html/reference/change-tracking-policies.html
/usr/share/doc/php-doctrine-orm/html/reference/configuration.html
/usr/share/doc/php-doctrine-orm/html/reference/dql-doctrine-query-language.html
/usr/share/doc/php-doctrine-orm/html/reference/events.html
/usr/share/doc/php-doctrine-orm/html/reference/faq.html
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/usr/share/doc/php-doctrine-orm/html/reference/installation.html
/usr/share/doc/php-doctrine-orm/html/reference/limitations-and-known-issues.html
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/usr/share/doc/php-doctrine-orm/html/reference/unitofwork-associations.html
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/usr/share/doc/php-doctrine-orm/html/reference/yaml-mapping.html