doc: add explanatory to path.resolve description

Fixes: https://github.com/nodejs/node/issues/25542

PR-URL: https://github.com/nodejs/node/pull/31430


Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: David Carlier <devnexen@gmail.com>
Reviewed-By: Rich Trott <rtrott@gmail.com>