Added billing information.

Author: csmulligan

articles/active-directory/external-identities/tutorial-bulk-invite.md

@@ -136,8 +136,6 @@ For example: `Remove-MgUser -UserId "lstokes_fabrikam.com#EXT#@contoso.onmicroso
 
 ## Next steps
 
-In this tutorial, you sent bulk invitations to guest users outside of your organization. Next, learn how the invitation redemption process works, and how to enforce multi-factor authentication for guest users.
-
-
 - [Learn about the Azure AD B2B collaboration invitation redemption process](redemption-experience.md)
 - [Enforce multi-factor authentication for B2B guest users](b2b-tutorial-require-mfa.md)
+- [Billing model for guest user collaboration usage](external-identities-pricing.md#about-monthly-active-users-mau-billing)