[docs] Doctest directives are not rendered into html or text?

[pydoc84 at scotdoyle.com]

The html and text documentation (3.6, 3.7, 3.8) for doctest directives at
  Library Reference -> 26.3 Doctest -> 26.3.3.6 Directives
is missing the actual directives, but they are visible in the
source at master/Doc/library/doctest.rst.


For example, doctest.rst has:

>>> print(list(range(20))) # doctest: +NORMALIZE_WHITESPACE

while the web and text documentation has:

>>> print(list(range(20)))