update docs regarding ESM and root hook plugins
update docs regarding ESM and root hook plugins

Signed-off-by: Christopher Hiller <cba4593484830aa757cb097d8d9f0ea9b692b304@boneskull.com>

adamgruber/mocha,mochajs/mocha,mochajs/mocha,outsideris/mocha,adamgruber/mocha,adamgruber/mocha,mochajs/mocha,outsideris/mocha