Add example applications for the LRU and LFU cache docs.
diff --git a/Doc/library/functools.rst b/Doc/library/functools.rst
index b2d69de..c6f5870 100644
--- a/Doc/library/functools.rst
+++ b/Doc/library/functools.rst
@@ -59,7 +59,8 @@
<http://en.wikipedia.org/wiki/Cache_algorithms#Least-Frequently_Used>`_
is indicated when the pattern of calls does not change over time, when
more the most common calls already seen are the best predictors of the
- most common upcoming calls.
+ most common upcoming calls (for example, a phonelist of popular
+ help-lines may have access patterns that persist over time).
.. versionadded:: 3.2
@@ -84,7 +85,9 @@
A `LRU (least recently used) cache
<http://en.wikipedia.org/wiki/Cache_algorithms#Least_Recently_Used>`_
is indicated when the pattern of calls changes over time, such as
- when more recent calls are the best predictors of upcoming calls.
+ when more recent calls are the best predictors of upcoming calls
+ (for example, the most popular articles on a news server tend to
+ change every day).
.. versionadded:: 3.2