Sphinx module index docs won't be generated unless a
module level docstring is included (ex [1]) with class refs.
As we don't include such module level refs in this project,
nothing is generated and thus no py-modindex.html
is created. This results in a dead link in our devref (see
bug report).
This change removes the modindex ref from our devref's
index to account for this fact. In the future if we wish to
add module documentation to support generation of
modindex we can add the ref back into our index.
[1] https://github.com/openstack/neutron/blob/
master/neutron/neutron_plugin_base_v2.py#L19
Change-Id: I2c7f9a58d398033cf4a8029d16b430fe34fcc56e
Closes-Bug: #1656355