docs(MessageManager): document return type of delete (#4012)
docs(MessageManager): document return type of delete (#4012)

* docs(MessageManager): document return type of delete

* docs(MessageManager): use Promise<void> over Promise

Co-Authored-By: Papaia <a34ff17e870d7945be07713cc8b407f3fab9363f@users.noreply.github.com>

Co-authored-by: Papaia <a34ff17e870d7945be07713cc8b407f3fab9363f@users.noreply.github.com>
SpaceEEC/discord.js,SpaceEEC/discord.js,SpaceEEC/discord.js