Update how-to-manage-azure-ad-users.md

Updated typo in Security Label and also added missing definitions of object types

Author: kabharati

articles/postgresql/flexible-server/how-to-manage-azure-ad-users.md

@@ -98,12 +98,15 @@ Azure Database for PostgreSQL Flexible Servers uses Security Labels associated w
 You can use the following SQL to assign security label:
 
 ```sql
-SECURITY LABEL for "pgaadauth" on role "<roleName>" is 'aadauth,oid=<objectId>'
+SECURITY LABEL for "pgaadauth" on role "<roleName>" is 'aadauth,oid=<objectId>',type=<user|group|service>,admin';
 ```
 
 **Parameters:**
 - *roleName* - Name of an existing PostgreSQL role to which Azure AD authentication needs to be enabled.
 - *objectId* - Unique object identifier of the Azure AD object.
+- *user* - End user principals.
+- *service* - Applications or Managed Identities connecting under their own service credentials.
+- *group* - Name of Azure AD Group.
 
 ## Next steps