docs: fix examples

Author: mrholek

docs/content/4.0/components/carousel.md

@@ -65,11 +65,6 @@ Adding in the previous and next controls. We recommend using `<button>` elements
       {{< placeholder width="800" height="400" class="docs-placeholder-img-lg d-block w-100" color="#333" background="#555" text="Third slide" >}}
     </div>
   </div>
-  <a class="carousel-control-prev" href="#carouselExampleControls" role="button" data-coreui-slide="prev">
-    <span class="carousel-control-prev-icon" aria-hidden="true"></span>
-    <span class="visually-hidden">Previous</span>
-  </a>
-  <a class="carousel-control-next" href="#carouselExampleControls" role="button" data-coreui-slide="next">
   <button class="carousel-control-prev" type="button" data-coreui-target="#carouselExampleControls" data-coreui-slide="prev">
     <span class="carousel-control-prev-icon" aria-hidden="true"></span>
     <span class="visually-hidden">Previous</span>