Remove outdated and confusing advice about setting maxsize (GH-19889) (GH-19890)
diff --git a/Doc/library/functools.rst b/Doc/library/functools.rst
index 3a0b554..0fb8d90 100644
--- a/Doc/library/functools.rst
+++ b/Doc/library/functools.rst
@@ -101,8 +101,7 @@
return sum(sentence.count(vowel) for vowel in 'aeiou')
If *maxsize* is set to ``None``, the LRU feature is disabled and the cache can
- grow without bound. The LRU feature performs best when *maxsize* is a
- power-of-two.
+ grow without bound.
If *typed* is set to true, function arguments of different types will be
cached separately. For example, ``f(3)`` and ``f(3.0)`` will be treated