Guidelines for renewals

Today, I received an email from Hunter letting me know that a book I had borrowed was overdue. The body of the email detailed renewal policies that I was not aware of (or had reason to look up). The gist of those policies is that you may renew online if all three conditions below are met:

1. you have less than $5 in fines CUNY-wide and
2. the item borrowed is less than 21 days overdue and
3. the item borrowed has not been requested by another person

I have updated the Renewals page in the reference wiki to include this information.