Clarify abbreviations for Azure AD DS

I am proposing to 
* use the same abbreviation for Azure AD, Azure AD DS and AD DS as other parts of the documentation
* link directly to the appropriate documentation for Azure AD

Author: tim-ntap

articles/azure-netapp-files/faq-smb.md

@@ -28,7 +28,7 @@ However, you can map multiple NetApp accounts that are under the same subscripti
 
 ## Does Azure NetApp Files support Azure Active Directory? 
 
-Both [Azure Active Directory (AD) Domain Services](../active-directory-domain-services/overview.md) and [Active Directory Domain Services (AD DS)](/windows-server/identity/ad-ds/get-started/virtual-dc/active-directory-domain-services-overview) are supported. You can use existing Active Directory domain controllers with Azure NetApp Files. Domain controllers can reside in Azure as virtual machines, or on premises via ExpressRoute or S2S VPN. Azure NetApp Files doesn't support AD join for [Azure Active Directory](https://azure.microsoft.com/resources/videos/azure-active-directory-overview/) at this time.
+Both [Azure Active Directory Domain Services (Azure AD DS)](../active-directory-domain-services/overview.md) and [Active Directory Domain Services (AD DS)](/windows-server/identity/ad-ds/get-started/virtual-dc/active-directory-domain-services-overview) are supported. You can use existing Active Directory domain controllers with Azure NetApp Files. Domain controllers can reside in Azure as virtual machines, or on premises via ExpressRoute or S2S VPN. Azure NetApp Files doesn't support AD join for [Azure Active Directory (Azure AD)](../active-directory/fundamentals) at this time.
 
 If you're using Azure NetApp Files with Azure Active Directory Domain Services, the organizational unit path is `OU=AADDC Computers` when you configure Active Directory for your NetApp account.