docs mention next/compat/router (#70425)
Lands https://github.com/vercel/next.js/pull/54317 as we can't update
the history cleanly on that PR anymore
Closes: https://github.com/vercel/next.js/pull/54317
Co-authored-by: Andrés Martínez <78830288+andresmarpz@users.noreply.github.com>
