doc: add table of contents to release guide
Also move Announce step to after technical stuff.
@nodejs/releasers
Rendered doc: https://github.com/targos/node/blob/release-doc-toc/doc/releases.md
Do not update/delete: Banner broadcast message test data
Do not update/delete: Notification broadcast message test data
Also move Announce step to after technical stuff.
@nodejs/releasers
Rendered doc: https://github.com/targos/node/blob/release-doc-toc/doc/releases.md