Azure AD docs should be re-named to Entra ID

[MJMowrer]

File: content/docs/pulumi-cloud/access-management/saml/aad.md

Azure AD is now known as Entra ID (https://www.microsoft.com/en-us/security/business/identity-access/microsoft-entra-id)

We should consider renaming the docs to be accurate, but it might be helpful to include (formerly Azure AD) to avoid confusion in the transition.