pythongh-104112: link from cached_property docs to method-caching FAQ

Author: carljm

Doc/library/functools.rst

@@ -110,18 +110,10 @@ The :mod:`functools` module defines the following functions:
    ``__slots__`` without including ``__dict__`` as one of the defined slots
    (as such classes don't provide a ``__dict__`` attribute at all).
 
-   If a mutable mapping is not available or if space-efficient key sharing
-   is desired, an effect similar to :func:`cached_property` can be achieved
-   by a stacking :func:`property` on top of :func:`cache`::
-
-       class DataSet:
-           def __init__(self, sequence_of_numbers):
-               self._data = sequence_of_numbers
-
-           @property
-           @cache
-           def stdev(self):
-               return statistics.stdev(self._data)
+   If a mutable mapping is not available or if space-efficient key sharing is
+   desired, an effect similar to :func:`cached_property` can also be achieved by
+   stacking :func:`property` on top of :func:`lru_cache`. See
+   :ref:`faq-cache-method-calls`
 
    .. versionadded:: 3.8