Add note about institution-specific terms

src/pages/legal/terms.mdx

@@ -8,6 +8,8 @@ Welcome to PrairieLearn! This document explains the terms of service (“Terms
 
 PrairieLearn is an open-source learning platform. PrairieLearn, Inc. (“we”, “us”, or “our”) is a company created to provide hosting and support for PrairieLearn software at [prairielearn.com](/) (the "Site"). These Terms apply only to software hosted by PrairieLearn, Inc. (the “Service”). If you use an instance of PrairieLearn hosted by another individual, company, organization, institution, or party, you will be bound by their terms and conditions, if specified.
 
+If your school, university, or organization has a separate agreement with PrairieLearn, Inc., that agreement will take precedence over these Terms.
+
 ## 1. Use of the Service
 
 Using the Service requires creating an account or signing in with an authentication provider. You’re responsible for all the activity on your account, and for keeping your password confidential and otherwise securing your account. If you find out that someone has used your account without your permissions, you should report it to support@prairielearn.com.