Remove .. versionadded:: 0.18

[topper-123]

Removed .. versionadded:: 0.18.0 and related text blocks.

[jbrockmendel]

is the policy something like keeping these for N releases? if so, is/should these be checked for in code_checks?

[topper-123]

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.

[gfyoung]

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).

[jreback]

thanks @topper-123

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