Docs: Rephrase 'img-fluid' explanation for clarity (and avoid passive voice). (#30190)

site/content/docs/4.3/content/images.md

@@ -8,7 +8,7 @@ toc: true
 
 ## Responsive images
 
-Images in Bootstrap are made responsive with `.img-fluid`. `max-width: 100%;` and `height: auto;` are applied to the image so that it scales with the parent element.
+Images in Bootstrap are made responsive with `.img-fluid`. This applies `max-width: 100%;` and `height: auto;` to the image so that it scales with the parent element.
 
 {{< example >}}
 {{< placeholder width="100%" height="250" class="bd-placeholder-img-lg img-fluid" text="Responsive image" >}}