Improve glossary entry for ABCs.

- Rename reST target name for collections ABCs to avoid collisions
- Add link to importlib ABCs (collections, numbers and io ABCs were already
  linked)
- Link to glossary entry from numbers module doc (other modules already do it)

1 files changed, 4 insertions, 3 deletions

diff --git a/Doc/library/collections.rst b/Doc/library/collections.rst
index 1a41a50..0b45fe1 100644
--- a/Doc/library/collections.rst
+++ b/Doc/library/collections.rst
@@ -33,8 +33,9 @@ Python's general purpose built-in containers, :class:`dict`, :class:`list`,
 =====================   ====================================================================
 
 In addition to the concrete container classes, the collections module provides
-:ref:`abstract-base-classes` that can be used to test whether a class provides a
-particular interface, for example, whether it is hashable or a mapping.
+:ref:`abstract base classes <collections-abstract-base-classes>` that can be
+used to test whether a class provides a particular interface, for example,
+whether it is hashable or a mapping.
 
 
 :class:`Counter` objects
@@ -984,7 +985,7 @@ attribute.
    subclass) or an arbitrary sequence which can be converted into a string using
    the built-in :func:`str` function.
 
-.. _abstract-base-classes:
+.. _collections-abstract-base-classes:
 
 ABCs - abstract base classes
 ----------------------------