Merge ABC and distutils touch-ups from 3.2.

I have removed the reST target I added in 38cdca2cc253: it is not necessary, as
people can link to the glossary entry or the abc module without it.

Two indentation fixes from 3.2 collections.rst have been ported to 3.3
collections.abc.rst.

Doc/glossary.rst

@@ -27,12 +27,14 @@ Glossary
       :ref:`2to3-reference`.
 
    abstract base class
-      :ref:`abstract-base-classes` complement :term:`duck-typing` by
+      Abstract base classes complement :term:`duck-typing` by
       providing a way to define interfaces when other techniques like
-      :func:`hasattr` would be clumsy. Python comes with many built-in ABCs for
-      data structures (in the :mod:`collections` module), numbers (in the
-      :mod:`numbers` module), and streams (in the :mod:`io` module). You can
-      create your own ABC with the :mod:`abc` module.
+      :func:`hasattr` would be clumsy or subtly wrong (for example with
+      :ref:`magic methods <special-lookup>`). Python comes with many built-in ABCs for
+      data structures (in the :mod:`collections.abc` module), numbers (in the
+      :mod:`numbers` module), streams (in the :mod:`io` module), import finders
+      and loaders (in the :mod:`importlib.abc` module).  You can create your own
+      ABCs with the :mod:`abc` module.
 
    argument
       A value passed to a function or method, assigned to a named local
@@ -430,8 +432,8 @@ Glossary
    mapping
       A container object that supports arbitrary key lookups and implements the
       methods specified in the :class:`Mapping` or :class:`MutableMapping`
-      :ref:`abstract base classes <abstract-base-classes>`. Examples include
-      :class:`dict`, :class:`collections.defaultdict`,
+      :ref:`abstract base classes <collections-abstract-base-classes>`.  Examples
+      include :class:`dict`, :class:`collections.defaultdict`,
       :class:`collections.OrderedDict` and :class:`collections.Counter`.
 
    metaclass

Doc/library/abc.rst

-.. _abstract-base-classes:
-
 :mod:`abc` --- Abstract Base Classes
 ====================================
 

Doc/library/collections.abc.rst

@@ -44,7 +44,7 @@ ABC                        Inherits from          Abstract Methods        Mixin
                            :class:`Iterable`,                             ``index``, and ``count``
                            :class:`Container`
 
-:class:`MutableSequence`   :class:`Sequence`      ``__setitem__``         Inherited :class:`Sequence` methods and
+:class:`MutableSequence`   :class:`Sequence`      ``__setitem__``,        Inherited :class:`Sequence` methods and
                                                   ``__delitem__``,        ``append``, ``reverse``, ``extend``, ``pop``,
                                                   ``insert``              ``remove``, ``clear``, and ``__iadd__``
 
@@ -175,7 +175,7 @@ Notes on using :class:`Set` and :class:`MutableSet` as a mixin:
 
 .. seealso::
 
-  * `OrderedSet recipe <http://code.activestate.com/recipes/576694/>`_ that uses
-    :class:`MutableSet`.
+   * `OrderedSet recipe <http://code.activestate.com/recipes/576694/>`_ for an
+     example built on :class:`MutableSet`.
 
    * For more about ABCs, see the :mod:`abc` module and :pep:`3119`.

Doc/library/numbers.rst

@@ -5,9 +5,9 @@
    :synopsis: Numeric abstract base classes (Complex, Real, Integral, etc.).
 
 
-The :mod:`numbers` module (:pep:`3141`) defines a hierarchy of numeric abstract
-base classes which progressively define more operations.  None of the types
-defined in this module can be instantiated.
+The :mod:`numbers` module (:pep:`3141`) defines a hierarchy of numeric
+:term:`abstract base classes <abstract base class>` which progressively define
+more operations.  None of the types defined in this module can be instantiated.
 
 
 .. class:: Number