Improve glossary entry for ABCs.
- Rename reST target name for collections ABCs to avoid collisions
- Link to glossary entry from numbers module doc (other modules already do it)
diff --git a/Doc/library/abc.rst b/Doc/library/abc.rst
index 9f70b02..0408f30 100644
--- a/Doc/library/abc.rst
+++ b/Doc/library/abc.rst
@@ -9,8 +9,8 @@
.. versionadded:: 2.6
-This module provides the infrastructure for defining an :term:`abstract base
-class` (ABCs) in Python, as outlined in :pep:`3119`; see the PEP for why this
+This module provides the infrastructure for defining :term:`abstract base
+classes <abstract base class>` (ABCs) in Python, as outlined in :pep:`3119`; see the PEP for why this
was added to Python. (See also :pep:`3141` and the :mod:`numbers` module
regarding a type hierarchy for numbers based on ABCs.)