Clarify that DictMixin is still useful. Only the UserDict class was supplanted.
diff --git a/Doc/lib/libuserdict.tex b/Doc/lib/libuserdict.tex
index 89d7428..ef643cc 100644
--- a/Doc/lib/libuserdict.tex
+++ b/Doc/lib/libuserdict.tex
@@ -4,22 +4,20 @@
\declaremodule{standard}{UserDict}
\modulesynopsis{Class wrapper for dictionary objects.}
-\note{This module is available for backward compatibility only. If
-you are writing code that does not need to work with versions of
-Python earlier than Python 2.2, please consider subclassing directly
-from the built-in \class{dict} type.}
-This module defines a class that acts as a wrapper around
-dictionary objects. It is a useful base class for
-your own dictionary-like classes, which can inherit from
-them and override existing methods or add new ones. In this way one
-can add new behaviors to dictionaries.
-
-The module also defines a mixin defining all dictionary methods for
-classes that already have a minimum mapping interface. This greatly
-simplifies writing classes that need to be substitutable for
+The module defines a mixin, \class{DictMixin}, defining all dictionary
+methods for classes that already have a minimum mapping interface. This
+greatly simplifies writing classes that need to be substitutable for
dictionaries (such as the shelve module).
+This also module defines a class, \class{UserDict}, that acts as a wrapper
+around dictionary objects. The need for this class has been largely
+supplanted by the ability to subclass directly from \class{dict} (a feature
+that became available starting with Python version 2.2). Prior to the
+introduction of \class{dict}, the \class{UserDict} class was used to
+create dictionary-like sub-classes that obtained new behaviors by overriding
+existing methods or adding new ones.
+
The \module{UserDict} module defines the \class{UserDict} class
and \class{DictMixin}: