doc: remove emailing the TSC from offboarding doc

Emailing the TSC seems superfluous. Removing it.

PR-URL: #39280
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Antoine du Hamel <duhamelantoine1995@gmail.com>
Reviewed-By: Robert Nagy <ronagy@icloud.com>
Reviewed-By: Michael Dawson <midawson@redhat.com>
Reviewed-By: Gireesh Punathil <gpunathi@in.ibm.com>
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
Reviewed-By: Beth Griggs <bgriggs@redhat.com>
Reviewed-By: Tobias Nießen <tniessen@tnie.de>

Author: Trott

doc/guides/offboarding.md

@@ -6,8 +6,6 @@ Emeritus or leaves the project.
 * Remove the Collaborator from the @nodejs/collaborators team.
 * Open a fast-track pull request to move the Collaborator to Collaborator
   Emeriti in README.md.
-* Email the TSC mailing list to notify TSC members that the Collaborator is
-  moving to Collaborator Emeritus.
 * Determine what GitHub teams the Collaborator belongs to. In consultation with
   the Collaborator, determine which of those teams they should be removed from.
   * Some teams may also require a pull request to remove the Collaborator from