Fix docs build

Author: derrabus

docs/en/reference/architecture.rst

@@ -79,9 +79,8 @@ Entities
 An entity is a lightweight, persistent domain object. An entity can
 be any regular PHP class observing the following restrictions:
 
--  An entity class can be final or read-only when
-   you use :ref:`native lazy objects <reference-native-lazy-objects>`.
-   It may contain final methods or read-only properties too.
+-  An entity class can be final or read-only. It may contain final
+   methods or read-only properties too.
 -  Any two entity classes in a class hierarchy that inherit
    directly or indirectly from one another must not have a mapped
    property with the same name. That is, if B inherits from A then B

docs/en/tutorials/getting-started.rst

@@ -49,9 +49,7 @@ An entity contains persistable properties. A persistable property
 is an instance variable of the entity that is saved into and retrieved from the database
 by Doctrine's data mapping capabilities.
 
-An entity class can be final or read-only when you use
-:ref:`native lazy objects <reference-native-lazy-objects>`.
-It may contain final methods or read-only properties too.
+An entity class can be final or read-only. It may contain final methods or read-only properties too.
 
 An Example Model: Bug Tracker
 -----------------------------