docs: correct outdated JSX namespace link (fixes #3582) (#3586)

Author: jacksydenham

docs/API/objects.mdx

@@ -191,7 +191,7 @@ return (
     <transformControls />
 ```
 
-If you're using TypeScript, you'll also need to [extend the JSX namespace](/tutorials/typescript#extending-jsx-intrinsic-elements).
+If you're using TypeScript, you'll also need to [extend the JSX namespace](/tutorials/v9-migration-guide#threeelements).
 
 ## Disposal