Fix typo in toggle buttons outlined styles section (#39200)

Author: kbsanders

site/content/docs/5.3/forms/checks-radios.md

@@ -305,7 +305,7 @@ Visually, these checkbox toggle buttons are identical to the [button plugin togg
 
 ### Outlined styles
 
-Different variants of `.btn`, such at the various outlined styles, are supported.
+Different variants of `.btn`, such as the various outlined styles, are supported.
 
 {{< example >}}
 <input type="checkbox" class="btn-check" id="btn-check-outlined" autocomplete="off">