Update the joystick configuration instructions

For task: Integrate Bluetooth Joystick to mobile VR set #86

leobot_web_server/web_content/config.html

@@ -27,7 +27,11 @@ <h5 class="select-heading">Select a joystick to configure or press any joystick
             <div class="alert alert-warning thumbstick-hint" role="alert">
                 <div class="exclamation-triangle"></div>
                 <div class="thumbstick-hint-content">
-                    <p>Please release all thumbsticks/analog controls before proceeding</p>
+                    <p>Please prepare your joystick before proceeding:</p>
+                    <ul>
+                        <li>Release all thumbsticks/analog controls</li>
+                        <li>Select the desired joystick mode if your model supports it</li>
+                    </ul>
                     <p>This is important for correct joystick calibration</p>
                 </div>
             </div>