docs(isr): update generateStaticParams-isr docs (#67056)
## Why?
You can also utilize `export cont dynamic = 'force-static'` to ISR pages
at runtime, instead of having to returning an empty array in
`generateStaticParams`.
x-ref: https://github.com/vercel/next.js/pull/66151,
https://github.com/vercel/next.js/issues/62195#issuecomment-2172549838
