meta: remove unnecessary onboarding step

While it is nice to notify the TSC about accepted nominations,
it is not strictly necessary and I think we should streamline
things as much as possible.

PR-URL: nodejs#46793
Reviewed-By: Robert Nagy <ronagy@icloud.com>
Reviewed-By: Antoine du Hamel <duhamelantoine1995@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Beth Griggs <bethanyngriggs@gmail.com>
Reviewed-By: Rafael Gonzaga <rafael.nunu@hotmail.com>
Reviewed-By: Chengzhong Wu <legendecas@gmail.com>
Reviewed-By: Michael Dawson <midawson@redhat.com>
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
Reviewed-By: Tobias Nießen <tniessen@tnie.de>
Reviewed-By: Richard Lau <rlau@redhat.com>
Reviewed-By: Trivikram Kamat <trivikr.dev@gmail.com>
Reviewed-By: Darshan Sen <raisinten@gmail.com>

Author: Trott

onboarding.md

@@ -10,8 +10,6 @@ onboarding session.
   possible to add them to the organization if they are not using two-factor
   authentication. If they cannot receive SMS messages from GitHub, try
   [using a TOTP mobile app][].
-* Announce the accepted nomination in a TSC meeting and in the TSC
-  mailing list.
 * Suggest the new Collaborator install [`node-core-utils`][] and
   [set up the credentials][] for it.