This PR fixes some ARIA Authoring Practices Guides broken links found in the documentation and tries to improve consistency in the text of those links.
I don't have access to the previous content so I'm not 100% sure that the modification is well https://www.w3.org/TR/wai-aria-practices/#something → https://www.w3.org/WAI/ARIA/apg/patterns/something/.
Feel free to comment or directly modify the links.
Note: if merged would need to be backported to v4