Update broken link to accessibility playbook URL

Author: dylanatsmith

content/guides/accessibility/links.mdx

@@ -31,7 +31,7 @@ People who have low or colorblind vision may have trouble identifying links that
 
 ### Functionality and purpose
 
-A link's function is to _navigate_ to a different page or new content. If instead a feature on the page is activated, use a `<button>`. [Learn when to use a link or button](https://accessibility-playbook.github.com/guidance/patterns/link-and-button-guidance).
+A link's function is to _navigate_ to a different page or new content. If instead a feature on the page is activated, use a `<button>`. [Learn when to use a link or button](https://accessibility-playbook.github.com/link-and-button-guidance).
 
 A link's purpose must be obvious from the link text alone. If you can't get an idea of where a link will take you based on the link text without reading the sourrounding text, the link text should be updated. [Learn how to write good link text](#writing-link-text).