Remove namespace packages from the list of unsupported features

Author: Guido van Rossum

docs/source/installed_packages.rst

@@ -25,7 +25,7 @@ the correct package directory. If that fails, you can use the
 find packages installed for that Python executable.
 
 Note that mypy does not support some more advanced import features, such as zip
-imports, namespace packages, and custom import hooks.
+imports and custom import hooks.
 
 If you do not want to use typed packages, use the ``--no-site-packages`` flag
 to disable searching.