[ADD] cake_shop: added button in knowledge

Author: dhrs-odoo

cake_shop/data/knowledge_article.xml

@@ -35,6 +35,8 @@
             <li>Confirm the RFQ</li>
             <li>Validate the reception for all quantities at once. <br /></li>
         </ul>
+        <a class="btn btn-primary mb-2" href="/odoo?tour=purchase_tour" data-bs-original-title="" title="">Purchase Flow Tutorial</a>
+        <p><br /></p>
         <h2><strong>Flow 2 : Point of Sale - Regular Sale</strong></h2>
         <p>For the Small Products, orders &amp; payments are done at the shop itself, and the delivery is also done at the shop itself</p>
         <p>To do that, start with a POS order:</p>