Make a form validation handler | handle form messages

add "aria-describedby" attribute on "supported elements" section

add "aria-describedby" attribute on server side succeed validation messages

site/content/docs/5.2/examples/checkout-rtl/index.html

@@ -4,8 +4,6 @@ title: مثال إتمام الشراء
 direction: rtl
 extra_css:
   - "../checkout/checkout.css"
-extra_js:
-  - src: "../checkout/checkout.js"
 body_class: "bg-light"
 ---
 
@@ -67,7 +65,7 @@ body_class: "bg-light"
       </div>
       <div class="col-md-7 col-lg-8">
         <h4 class="mb-3">عنوان الفوترة</h4>
-        <form class="needs-validation" novalidate>
+        <form data-bs-toggle="form-validation">
           <div class="row g-3">
             <div class="col-sm-6">
               <label for="firstName" class="form-label">الاسم الأول</label>