docs: native db drivers with sync queries (#92572)
Closes: https://github.com/vercel/next.js/issues/86379
A native db driver, or sync db driver, won't be detected as external
data, rather, as sync I/O.
Main motivation is that better-sqlit3 is popular, and Node.js has
introduced a native sql driver module.
Given no other uncached data, or runtime data access, these queries
would be included in the static shell. Wrapping with Suspense is not
sufficient.
