It's not called "Zope 3" anymore and this little stub really doesn't add a lot.

doc/ZOPE3.rst

-Using Zope Components in Zope 2 Applications
-============================================
-
-Background
-----------
-
-Zope 3 is a separate project from the Zope community aimed at web
-development. It is designed to be more 'programmer-centric' and easier
-to learn, use and extend for programmers. Zope 3 introduces an
-interface-centric component architecture that makes it easier to develop
-and deploy components without requiring developers to learn and
-understand the entire Zope framework.
-
-As of Zope 2.8, the "Five" project has been integrated into the 
-Zope 2 core. The "Five" project implements a compatibility layer 
-that allows many Zope 3 components and patterns to be used in 
-new and existing Zope 2 applications.
-
-Features
---------
-
-The Five integration layer provides support for Zope 3 interfaces, 
-Zope Configuration Markup Language (ZCML), adapters, views, 
-utilities and schema-driven content.
-
-Note that the Five layer does *not* attempt to provide a ZMI user 
-interface for Zope 3 components.
-
-Zope 2 includes the essential Zope 3 packages, so it is not 
-necessary to install Zope 3.

doc/index.rst

@@ -11,7 +11,6 @@ Contents:
    CHANGES.rst
    INSTALL.rst
    SECURITY.rst
-   ZOPE3.rst
    SETUID.rst
    SIGNALS.rst
    DEBUGGING.rst