Is there a good summary somewhere of how to delete your user account on a Moodle site? I want to give users instructions on this so that they may be able to delete their accounts if they choose to.
They can't. There's no option to delete your own account.
What they can do (but you have to manage this manually yourself) is go to their profile and in the Privacy and Policies section, click Delete my account - this sends a message to the admin (or Privacy officer if you have one) who then has to manually delete the account.