fix(admin): require adminRoles option for a role to be considered an admin role

docs/content/docs/plugins/admin.mdx

@@ -514,6 +514,20 @@ admin({
   defaultRole: "regular",
 });
 ```
+### Admin Roles
+
+The roles that are considered admin roles. Defaults to `["admin"]`.
+
+```ts title="auth.ts"
+admin({
+  adminRoles: ["admin", "superadmin"],
+});
+```
+
+<Callout type="warning">
+  Any role that isn't in the `adminRoles` list, even if they have the permission,
+  will not be considered an admin.
+</Callout>
 
 ### Admin userIds
 
@@ -525,6 +539,8 @@ admin({
 })
 ```
 
+If a user is in the `adminUserIds` list, they will be able to perform any admin operation.
+
 ### impersonationSessionDuration
 
 The duration of the impersonation session in seconds. Defaults to 1 hour.