tools,doc: fix 404 broken links in docs

Change the `linkManPages()` function to catch the `uname` and `curl`
correct websites on the docs page.

PR-URL: https://github.com/nodejs/node/pull/27168
Fixes: https://github.com/nodejs/node/issues/26074


Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>