Comment 6 for bug 1889071

The Charm Guide now includes detailed information on using network spaces in a Charmed OpenStack context. It does explicitly mention that spaces for subordinate charms must be a subset of those of the principal [0] as well as state that an assigned binding does not guarantee network connectivity. Consequently, I'm going to remove the bug task for the Charm Guide.

[0]: https://docs.openstack.org/charm-guide/latest/concepts/spaces.html#subordinate-applications