Update success_image.html (#442)

Added troubleshooting checklist

scheduler/src/templates/stripe/success_image.html

@@ -25,9 +25,10 @@ <h2>Using your hotspot</h2>
             <p>Once the image has been downloaded, flash it onto a microSD card (we recommend <a href="https://www.raspberrypi.com/software/">Raspberry Pi Imager</a>, but any such tool will do).</p>
             <p>Insert the card into your Raspberry Pi, plug it in, and wait for approximately 1-2 minutes during the initial boot-up process until you see the network status display <em>Ready</em> (or <em>Wikipedia</em> if you purchased Wikipedia image) appear in your wifi settings.</p>
             <p>Connect to it and a captive portal should appear after a few seconds. If not, then open <a href="http://goto.kiwix.hotspot">http://goto.kiwix.hotspot</a> in your favourite browser.</p>
+            <p>If you encounter any issue, check out our <a href="https://kiwix.org/en/hotspot-checklist-and-troubleshooting/">troubleshooting checklist</a> before reaching out by responding to this email.</p>
             <p>Enjoy!</p>
             <p>&nbsp;</p>
-            <p>Once the download has started you can go back to <a href="{{ shop_url }}">kiwix.org</a>.</p>
+            <p>Once your download has started you can go back to <a href="{{ shop_url }}">kiwix.org</a>.</p>
         </div>
     </div>
     {% endblock %}