This clarifies that the parameter sets CSP 'frame-ancestors'
to limit hosts allowed to embed comments. The commit also improves
the documentation on how to use ALLOWED_HOSTS with AUTH_SAME_SITE
for different setup scenarios.
We might want to change AUTH_SAME_SITE to `strong` in v2.0 as it works
on the subdomain of the same site as well as current Lax option.
Dmitry VerkhoturovandUmputun
dd2cff6a13