Docs Are Not Clear on How to Share a Queue Between Interpreters

[ericsnowcurrently]

Documentation

Users create cross-interpreter queues by calling concurrent.interpreters.create_queue(). @terryjreedy pointed out that the docs aren't clear about how to get a queue in one interpreter over to another interpreter. See #139383 (comment).

The docs entry for concurrent.interpreters.create_queue() should call this case out specifically and include a short example code snippet. It would probably be smart to add something similar to the docs entry for Interpreter.prepare_main(); the original motivation for that method was to pass a queue to another interpreter.