Update authentication.md

correct name of Azure AD Domain Services

Author: kpraxor

articles/virtual-desktop/authentication.md

@@ -24,7 +24,7 @@ Since users must be discoverable through Azure Active Directory (Azure AD) to ac
 
 ### Hybrid identity
 
-Azure Virtual Desktop supports [hybrid identities](../active-directory/hybrid/whatis-hybrid-identity.md) through Azure AD, including those federated using AD FS. You can manage these user identities in AD DS and sync them to Azure AD using [Azure AD Connect](../active-directory/hybrid/whatis-azure-ad-connect.md). You can also use Azure AD to manage these identities and sync them to [Azure AD Directory Services (Azure AD DS)](../active-directory-domain-services/overview.md).
+Azure Virtual Desktop supports [hybrid identities](../active-directory/hybrid/whatis-hybrid-identity.md) through Azure AD, including those federated using AD FS. You can manage these user identities in AD DS and sync them to Azure AD using [Azure AD Connect](../active-directory/hybrid/whatis-azure-ad-connect.md). You can also use Azure AD to manage these identities and sync them to [Azure AD Domain Services (Azure AD DS)](../active-directory-domain-services/overview.md).
 
 When accessing Azure Virtual Desktop using hybrid identities, sometimes the User Principal Name (UPN) or Security Identifier (SID) for the user in Active Directory (AD) and Azure AD don't match. For example, the AD account [email protected] may correspond to [email protected] in Azure AD. Azure Virtual Desktop only supports this type of configuration if either the UPN or SID for both your AD and Azure AD accounts match. SID refers to the user object property "ObjectSID" in AD and "OnPremisesSecurityIdentifier" in Azure AD.