Documentation is different given URL used to access it
The documentation website is not the same given how you access it.
If you go to https://react-hook-form.com/, the API url in the menu is https://react-hook-form.com/docs, and this page lists the beta createFormControl API.
If you go on https://www.react-hook-form.com/, there's a link to legacy docs for v5/v6, and the API link in the header points to https://www.react-hook-form.com/api/, which does not shows the createFormControl API.
I keep running across this, as well, and wondering why the subscribe API wasn't on the page.
https://react-hook-form.com contains the latest documentation, while https://www.react-hook-form.com seems to be for a much older version without the subscribe API.
Sounds like a redirect needs from one to another to prevent people like me from being confused :)