* The `SimpleBrokerMessageHandler` has been fixed the way it consults
a `session` store for sending reply.
The session can be added to that store only when we send a `CONNECT`
command.
Fix `WebSocketInboundChannelAdapter` to send additional `CONNECT` message
in the `afterSessionStarted()` and when selected `SubProtocolHandler` is
a `StompSubProtocolHandler`
* Add extract check into the `StompIntegrationTests` for events: now
we also get a `SessionConnectedEvent` as well
* Fix typo in the `index-docinfo.xml`