doc: put landing specifics in details tag

Showing all the steps isn't usually useful and makes it seem like the
collaborator is meant to follow the manual steps. I've seen this happen
during at least one onboarding. The section is also a bit long to
comfortably scroll over quickly to find the next section.

Let's put those steps in a details block to make it more obvious that it
is there for unusual situations only.

Co-authored-by: Shelley Vohr <codebytere@gmail.com>

PR-URL: https://github.com/nodejs/node/pull/35296


Reviewed-By: Michaël Zasso <targos@protonmail.com>
Reviewed-By: Richard Lau <riclau@uk.ibm.com>
Reviewed-By: Michael Dawson <midawson@redhat.com>