Remove .. versionadded:: 0.18
Removed ``.. versionadded:: 0.18.0`` and related text blocks.
is the policy something like keeping these for N releases?  if so, is/should these be checked for in code_checks? There isn't a policy at the moment, the previous rounds I've just removed on my own initiative.

I'm not convinced that a policy check is practical, there could be many minor versions or fewer larger versions, and a check wouldn't catch that. > There isn't a policy at the moment, the previous rounds I've just removed on my own initiative.

I think it makes to create a policy, but we can do that afterwards.  That being said, `0.18.0` is pretty safe to remove.  I would consider `0.19.x` as well (either here or in a new PR). thanks @topper-123 

yeah certainly anything < 0.20.3 is fair game at this point.