webrepl.html: Add hint about terminal widget focus.

Author: Paul Sokolovsky

webrepl.html

@@ -39,6 +39,7 @@
 <div id="term">
 </div>
 <br clear="both" />
+<i>Terminal widget should be focused (text cursor visible) to accept input. Click on it if not.</i><br/>
 <i>To paste, press Ctrl+A, then Ctrl+V</i>
 </body>