Tentatively connect to the device before returning from requestDevice().

This also explains what to do if the user cancels the device picker.

It's still uncertain whether this is the right decision: see #2.

index.html

@@ -161,6 +161,13 @@ <h2>Device Discovery</h2>
             <li>
               Wait for the user to have made their selection.
             </li>
+            <li>
+              If the user cancels the prompt, reject the Promise with a <a>NotFoundError</a> and abort these steps.
+            </li>
+            <li>
+              Connect to the device. ([[BLUETOOTH41]] 3.G.6.2.1)
+              If the connection fails, reject the Promise with a <a>NetworkError</a> and abort these steps.
+            </li>
             <li>
               Resolve the <a>Promise</a> with a <a>BluetoothDevice</a> instance representing the selected device.
             </li>