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

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)))