doc: put release script specifics in details

Listing all the steps can be confusing an make it seem like
the releaser is meant to run each of these steps manually. In fact
I personally did that my first release.

Let's put those steps in a details block to make it more obvious
that it is informational and not steps to follow

PR-URL: https://github.com/nodejs/node/pull/35260


Reviewed-By: Richard Lau <riclau@uk.ibm.com>
Reviewed-By: Ruy Adorno <ruyadorno@github.com>
Reviewed-By: Daijiro Wachi <daijiro.wachi@gmail.com>
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Michaël Zasso <targos@protonmail.com>