Replace 'shadow' references on the border radius docs page

Author: CraigChilds94

docs/source/docs/border-radius.blade.md

@@ -94,7 +94,7 @@ title: "Border Radius"
 
 ## Rounded corners
 
-Use the `.rounded`, `.shadow-sm`, or `.rounded-lg` utilities to apply different border radius sizes to an element.
+Use the `.rounded`, `.rounded-sm`, or `.rounded-lg` utilities to apply different border radius sizes to an element.
 
 @component('_partials.code-sample', ['class' => 'flex justify-around text-sm'])
 <div class="bg-grey-light mr-3 p-4 rounded-sm">.rounded-sm</div>
@@ -152,7 +152,7 @@ Use the `.rounded-t`, `.rounded-r`, `.rounded-b`, or `.rounded-l` utilities to o
 
 ## Responsive
 
-To control the shadow of an element at a specific breakpoint, add a `{breakpoint}:` prefix to any existing shadow utility. For example, use `md:shadow-lg` to apply the `shadow-lg` utility at only medium screen sizes and above.
+To control the border radius of an element at a specific breakpoint, add a `{breakpoint}:` prefix to any existing border radius utility. For example, use `md:rounded-lg` to apply the `rounded-lg` utility at only medium screen sizes and above.
 
 For more information about Tailwind's responsive design features, check out the [Responsive Design](/workflow/responsive-design) documentation.