Clean up reference pointers list

Author: wouterj

book/doctrine.rst

@@ -1382,10 +1382,8 @@ For more information about Doctrine, see the *Doctrine* section of the
 .. _`Query Builder`: http://docs.doctrine-project.org/projects/doctrine-orm/en/latest/reference/query-builder.html
 .. _`Doctrine Query Language`: http://docs.doctrine-project.org/projects/doctrine-orm/en/latest/reference/dql-doctrine-query-language.html
 .. _`Association Mapping Documentation`: http://docs.doctrine-project.org/projects/doctrine-orm/en/latest/reference/association-mapping.html
-.. _`DateTime`: http://php.net/manual/en/class.datetime.php
 .. _`Mapping Types Documentation`: http://docs.doctrine-project.org/projects/doctrine-orm/en/latest/reference/basic-mapping.html#doctrine-mapping-types
-.. _`Property Mapping documentation`: http://docs.doctrine-project.org/projects/doctrine-orm/en/latest/reference/basic-mapping.html#property-mapping
+.. _`Property Mapping`: http://docs.doctrine-project.org/projects/doctrine-orm/en/latest/reference/basic-mapping.html#property-mapping
 .. _`Lifecycle Events documentation`: http://docs.doctrine-project.org/projects/doctrine-orm/en/latest/reference/events.html#lifecycle-events
 .. _`Reserved SQL keywords documentation`: http://docs.doctrine-project.org/projects/doctrine-orm/en/latest/reference/basic-mapping.html#quoting-reserved-words
 .. _`Persistent classes`: http://docs.doctrine-project.org/projects/doctrine-orm/en/latest/reference/basic-mapping.html#persistent-classes
-.. _`Property Mapping`: http://docs.doctrine-project.org/projects/doctrine-orm/en/latest/reference/basic-mapping.html#property-mapping