Fix-up docs for the copyreg module renaming.

Doc/library/copy.rst

@@ -63,7 +63,7 @@ of lists by assigning a slice of the entire list, for example,
 
 Classes can use the same interfaces to control copying that they use to control
 pickling.  See the description of module :mod:`pickle` for information on these
-methods.  The :mod:`copy` module does not use the :mod:`copy_reg` registration
+methods.  The :mod:`copy` module does not use the :mod:`copyreg` registration
 module.
 
 .. index::

Doc/library/copyreg.rst

@@ -1,19 +1,23 @@
-
-:mod:`copy_reg` --- Register :mod:`pickle` support functions
-============================================================
+:mod:`copyreg` --- Register :mod:`pickle` support functions
+===========================================================
 
 .. module:: copy_reg
+   :synopsis: Old name for the copyreg module.
+
+.. module:: copyreg
    :synopsis: Register pickle support functions.
 
 .. note::
-    The :mod:`copy_reg` module has been renamed to `copyreg` in Python 3.0.
+   The :mod:`copy_reg` module has been renamed to :mod:`copyreg` in Python 3.0.
+   It is importable under both names in Python 2.6 and the rest of the 2.x
+   series.
 
 .. index::
    module: pickle
    module: cPickle
    module: copy
 
-The :mod:`copy_reg` module provides support for the :mod:`pickle` and
+The :mod:`copyreg` module provides support for the :mod:`pickle` and
 :mod:`cPickle` modules.  The :mod:`copy` module is likely to use this in the
 future as well.  It provides configuration information about object constructors
 which are not classes.  Such constructors may be factory functions or class

Doc/library/persistence.rst

@@ -19,7 +19,7 @@ The list of modules described in this chapter is:
 .. toctree::
 
    pickle.rst
-   copy_reg.rst
+   copyreg.rst
    shelve.rst
    marshal.rst
    anydbm.rst

Doc/library/pickle.rst

@@ -535,7 +535,7 @@ not :meth:`__reduce_ex__`, the :meth:`__reduce_ex__` implementation detects this
 and calls :meth:`__reduce__`.
 
 An alternative to implementing a :meth:`__reduce__` method on the object to be
-pickled, is to register the callable with the :mod:`copy_reg` module.  This
+pickled, is to register the callable with the :mod:`copyreg` module.  This
 module provides a way for programs to register "reduction functions" and
 constructors for user-defined types.   Reduction functions have the same
 semantics and interface as the :meth:`__reduce__` method described above, except
@@ -786,7 +786,7 @@ the same process or a new process. ::
 
 .. seealso::
 
-   Module :mod:`copy_reg`
+   Module :mod:`copyreg`
       Pickle interface constructor registration for extension types.
 
    Module :mod:`shelve`