Yep! You can choose to add a new section under "Other concrete types", maybe "typing.io and typing.re submodules" then talk about how we could import from them in the past, but they're now deprecated and going to be removed.

Alternatively, you can remove the existing notice, and just place a big note (..note::) underneath with the content above.

> I'm not sure if I'll have the time

No worries. We're not in a hurry. If you haven't checked it out already (and to save you some time) the devguide is here:
https://devguide.python.org/pullrequest/#quick-guide

You can probably skip some parts (like running tests) for a docs-only change. The main things are:
1. Please sign the CLA https://devguide.python.org/pullrequest/#licensing.
2. Make the change on main branch and send a PR over.

We can review your changes once the PR is open. Thanks for your interest in contributing! (once again, no pressure, if you feel at any time you're too busy to take this up, it's perfectly okay).