Update content/components/cards.mdx

Co-authored-by: Hahnbee Lee <[email protected]>

Author: lawreka

content/components/cards.mdx

@@ -42,7 +42,7 @@ Add an `img` property to a card to display an image on the top of the card.
 
 ### Link Card
 
-You can customize the CTA and whether or not you show the arrow on the card. 
+You can customize the CTA and whether or not to display the arrow on the card. By default, the arrow will only show for external links.
 
 <Card title="Link card" icon="link" href="/content/components/card-groups" arrow="true" cta="Click here">
   This is how you use a card with an icon and a link. Clicking on this card