Apply suggestions from code review

Co-authored-by: Stan Ulbrych <89152624+StanFromIreland@users.noreply.github.com>

Author: corona10

Doc/whatsnew/3.15.rst

@@ -188,9 +188,9 @@ raise :exc:`SyntaxError`).
 :pep:`814`: Add frozendict built-in type
 ----------------------------------------
 
-A new public immutable type, :class:`frozendict`, is added to the :mod:`builtins` module.
+A new :term:`immutable` type, :class:`frozendict`, is added to the :mod:`builtins` module.
 It does not allow modification after creation. A ``frozendict`` is not a subclass of ``dict``;
-it inherits directly from ``object``. A ``frozendict`` is hashable (i.e., ``hash(frozendict)`` works)
+it inherits directly from ``object``. A ``frozendict`` is :term:`hashable`
 as long as all of its keys and values are hashable.
 
 For example::