[3.11] Clarify re docs for byte pattern group names (GH-99308)

[Kentzo]

• Issue: Cryptic deprecation notice in the re module #99308

[slateny]

Per comment I don't believe there should be a backport for this.

[Kentzo]

#99308 (comment) says otherwise

[CAM-Gerlach]

Thanks @Kentzo . One set of suggestions, otherwise LGTM

[hauntsaninja]

Thanks for backporting this!

Looks like it's common enough for past versions of docs to contain "removed" for future versions of Python, so would you mind applying CAM's suggestions?

Edit: Since this has been lying around, I think this is fine to merge as is without the more specific directives; 3.12 isn't finalised and this seems like a short time between deprecation and removal.