doc: update releases guide re pushing tags

Currently we specify pushing the tag before updating any of the
branches. This creates a potential of creating and pushing a tag
on an out of sync branch, and only really when attempting to merge
the release commit that things have gone out of sync.

Changing the order here would minimize the possibility of this error

PR-URL: https://github.com/nodejs/node/pull/31855


Reviewed-By: Richard Lau <riclau@uk.ibm.com>
Reviewed-By: Shelley Vohr <codebytere@gmail.com>
Reviewed-By: Beth Griggs <Bethany.Griggs@uk.ibm.com>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>
Reviewed-By: Trivikram Kamat <trivikr.dev@gmail.com>