Avoid title case in flowing text (backport from 3.2)
diff --git a/Doc/library/collections.rst b/Doc/library/collections.rst
index 9f6d079..96895dd 100644
--- a/Doc/library/collections.rst
+++ b/Doc/library/collections.rst
@@ -28,8 +28,9 @@
===================== ==================================================================== ===========================
In addition to the concrete container classes, the collections module provides
-:ref:`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.
+: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.
.. seealso::