[doc] Remove references to PyChecker. (GH-22011)
diff --git a/Doc/faq/design.rst b/Doc/faq/design.rst
index 4e3cc57..8cf271c 100644
--- a/Doc/faq/design.rst
+++ b/Doc/faq/design.rst
@@ -573,8 +573,7 @@
:class:`~collections.abc.MutableMapping`.
For Python, many of the advantages of interface specifications can be obtained
-by an appropriate test discipline for components. There is also a tool,
-PyChecker, which can be used to find problems due to subclassing.
+by an appropriate test discipline for components.
A good test suite for a module can both provide a regression test and serve as a
module interface specification and a set of examples. Many Python modules can