Add a note about Billing Admin users and seat licenses.

Author: jmacdotorg

docs/guides/roles.md

@@ -104,6 +104,10 @@ You can't grant the **Billing Admin** role to an existing user account. To add a
 
 ### Add billing admin accounts {#billing}
 
+:::note
+Billing Admin users don't requrie CodeRabbit seat licenses. You can add Billing Admin users regardless of how many seat licenses you have available.
+:::
+
 To add a CodeRabbit user account with the **Billing Admin** role, follow these steps:
 
 1. Go to your organization's list of user accounts, as detailed in [View roles](#view-roles).