update api doc link in hooks page to version 0.20

Author: ta32

website/versioned_docs/version-0.20/concepts/function-components/hooks/introduction.mdx

@@ -38,7 +38,7 @@ Yew comes with the following predefined Hooks:
 -   `use_context`
 -   `use_force_update`
 
-The documentation for these hooks can be found in the [Yew API docs](https://yew-rs-api.web.app/next/yew/functional/)
+The documentation for these hooks can be found in the [Yew API docs](https://docs.rs/yew/0.20.0/yew/functional/index.html)
 
 ### Custom Hooks