doc: keep the names in sorted order

1. The release team's names were not in the sorted order and

2. the old list of releasers' names were not in bold

This patch fixes both of these issues

PR-URL: https://github.com/nodejs/node/pull/4876


Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
Reviewed-By: Roman Klauke <romaaan.git@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Roman Reiss <me@silverwind.io>