bpo-37469: Document usability of SimpleQueue with QueueHandler and QueueListener. (GH-14521) (GH-14526)

(cherry picked from commit e6b64b7)

Author: miss-islington

Doc/library/logging.handlers.rst

@@ -971,9 +971,11 @@ possible, while any potentially slow operations (such as sending an email via
 .. class:: QueueHandler(queue)
 
    Returns a new instance of the :class:`QueueHandler` class. The instance is
-   initialized with the queue to send messages to. The queue can be any
-   queue-like object; it's used as-is by the :meth:`enqueue` method, which needs
-   to know how to send messages to it.
+   initialized with the queue to send messages to. The *queue* can be any
+   queue-like object; it's used as-is by the :meth:`enqueue` method, which
+   needs to know how to send messages to it. The queue is not *required* to
+   have the task tracking API, which means that you can use
+   :class:`~queue.SimpleQueue` instances for *queue*.
 
 
    .. method:: emit(record)
@@ -1029,11 +1031,14 @@ possible, while any potentially slow operations (such as sending an email via
    initialized with the queue to send messages to and a list of handlers which
    will handle entries placed on the queue. The queue can be any queue-like
    object; it's passed as-is to the :meth:`dequeue` method, which needs
-   to know how to get messages from it. If ``respect_handler_level`` is ``True``,
-   a handler's level is respected (compared with the level for the message) when
-   deciding whether to pass messages to that handler; otherwise, the behaviour
-   is as in previous Python versions - to always pass each message to each
-   handler.
+   to know how to get messages from it. The queue is not *required* to have the
+   task tracking API (though it's used if available), which means that you can
+   use :class:`~queue.SimpleQueue` instances for *queue*.
+
+   If ``respect_handler_level`` is ``True``, a handler's level is respected
+   (compared with the level for the message) when deciding whether to pass
+   messages to that handler; otherwise, the behaviour is as in previous Python
+   versions - to always pass each message to each handler.
 
    .. versionchanged:: 3.5
       The ``respect_handler_levels`` argument was added.