Changelogs for OAuth updates

Author: bbiggerr

src/content/changelog/4-81-0-2020-12-02.md

@@ -12,3 +12,7 @@ changelog:
 
   - [Managed Service Create](/docs/api/managed/#managed-service-create) (POST /managed/services)
   - [Managed Service Update](/docs/api/managed/#managed-service-update) (PUT /managed/services/{serviceId})
+
+- [OAuth Reference](/docs/api/#oauth-reference) has been updated to include Firewall, Maintenance, and Object Storage security scopes.
+
+- The OAuth scope for the [Event Mark as Seen](/docs/api/account/#event-mark-as-seen) (POST /account/events/{eventId}/seen) endpoint has been corrected to `events:read_write`. Previously, it was stated as `events:read_only`.