Tweak weakref explanation

hypothesis-python/RELEASE.rst

@@ -1,11 +1,9 @@
 RELEASE_TYPE: minor
 
-Since :ref:`v6.27.1` the backing data structure of 
-:func:`~hypothesis.register_random` is a :class:`weakref.WeakKeyDictionary`. As a 
-consequence, passing an unreferenced object to :func:`~hypothesis.register_random` will 
-have no affect on Hypothesis' tracking of RNG sources. This patch modifies 
-:func:`~hypothesis.register_random` to raise an error when it is passed an unreferenced 
-object, and to emit a warning when it looks like it was passed an object that is only 
-referenced within a temporary scope. These checks are skipped by PyPy's interpreter. 
-The type annotation of :func:`~hypothesis.register_random` was also widened to permit 
-structural subtypes of ``random.Random``.
+:func:`~hypothesis.register_random` has used :mod:`weakref` since :ref:`v6.27.1`,
+allowing the :class:`~random.Random`-compatible objects to be garbage-collected when
+there are no other references remaining in order to avoid memory leaks.
+We now raise an error or emit a warning when this seems likely to happen immediately.
+
+The type annotation of :func:`~hypothesis.register_random` was also widened so that
+structural subtypes of :class:`~random.Random` are accepted by static typecheckers.

hypothesis-python/docs/changes.rst

@@ -1181,7 +1181,7 @@ This patch makes the :command:`hypothesis codemod`
 -------------------
 
 This patch changes the backing datastructures of :func:`~hypothesis.register_random`
-and a few internal caches to use :class:`weakref.WeakKeyDictionary`.  This reduces
+and a few internal caches to use :class:`weakref.WeakValueDictionary`.  This reduces
 memory usage and may improve performance when registered :class:`~random.Random`
 instances are only used for a subset of your tests (:issue:`3131`).