Replace img-fluid by w-100 to conform with HTML

docs/4.0/components/carousel.md

@@ -24,7 +24,7 @@ Carousels don't automatically normalize slide dimensions. As such, you may need
 
 ### Slides only
 
-Here's a carousel with slides only. Note the presence of the `.d-block` and `.img-fluid` on carousel images to prevent browser default image alignment.
+Here's a carousel with slides only. Note the presence of the `.d-block` and `.w-100` on carousel images to prevent browser default image alignment.
 
 {% example html %}
 <div id="carouselExampleSlidesOnly" class="carousel slide" data-ride="carousel">