Fix docs example on how to use the shared worker

dev.html

@@ -42,6 +42,7 @@
         websocket_url: 'wss://conversejs.org/xmpp-websocket',
         // websocket_url: 'ws://chat.example.org:5380/xmpp-websocket',
         whitelisted_plugins: ['converse-debug'],
+        connection_options: { worker: '/dist/shared-connection-worker.js' }
     });
 </script>
 </body>

docs/source/configuration.rst

@@ -693,7 +693,7 @@ appear in another.
 .. code-block:: javascript
 
         converse.initialize({
-            connection_options: { 'worker': true }
+            connection_options: { worker: '/dist/shared-connection-worker.js' }
         });