Fix WebSocketInChA according latest SF

* 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`

src/reference/asciidoc/index-docinfo.xml

@@ -37,11 +37,10 @@
       </author><author>
         <firstname>Amol</firstname>
         <surname>Nayak</surname>
-      </author>
-    </author><author>
+      </author><author>
       <firstname>Jay</firstname>
       <surname>Bryant</surname>
-    </author>
+      </author>
     </authorgroup>
 
     <copyright>