No max_children in socketserver.ForkingMixIn documentation

[AEErshov]

Documentation

There is nothing about max_children attribute of socketserver.ForkingMixIn class in documentation.

Linked PRs

• gh-111872: Document the max_children attribute for socketserver.ForkingMixIn #118134

[aisk]

Also timeout (Mentioned in BaseServer's document).

And there is a active_children for ForkingMixIn asides there attributes, but this is for internal usage to store the current spawned processed. I think it should have a underscore before it's name, just like _threads attributes in ThreadingMixIn.

(I think is is not related issue so I marked it as off-topic)