Examples: use <main> in Cheatsheet examples (#40577)

Author: coliff

site/content/docs/5.3/examples/cheatsheet-rtl/index.html

@@ -71,7 +71,7 @@ <h2 class="h6 pt-4 pb-3 mb-4 border-bottom">على هذه الصفحة</h2>
     </ul>
   </nav>
 </aside>
-<div class="bd-cheatsheet container-fluid bg-body">
+<main class="bd-cheatsheet container-fluid bg-body">
   <section id="content">
     <h2 class="sticky-xl-top fw-bold pt-3 pt-xl-5 pb-2 pb-xl-3">المحتوى</h2>
 
@@ -1538,7 +1538,7 @@ <h3>التلميحات</h3>
       </div>
     </article>
   </section>
-</div>
+</main>
 
 <div class="modal fade" id="exampleModalDefault" tabindex="-1" aria-labelledby="exampleModalLabel" aria-hidden="true">
   <div class="modal-dialog">

site/content/docs/5.3/examples/cheatsheet/index.html

@@ -70,7 +70,7 @@ <h2 class="h6 pt-4 pb-3 mb-4 border-bottom">On this page</h2>
     </ul>
   </nav>
 </aside>
-<div class="bd-cheatsheet container-fluid bg-body">
+<main class="bd-cheatsheet container-fluid bg-body">
   <section id="content">
     <h2 class="sticky-xl-top fw-bold pt-3 pt-xl-5 pb-2 pb-xl-3">Contents</h2>
 
@@ -1534,7 +1534,7 @@ <h3>Tooltips</h3>
       </div>
     </article>
   </section>
-</div>
+</main>
 
 <div class="modal fade" id="exampleModalDefault" tabindex="-1" aria-labelledby="exampleModalLabel" aria-hidden="true">
   <div class="modal-dialog">