Remove Azure AD reference from Identity README (#43210)

Author: scottaddie

sdk/identity/azure-identity/README.md

@@ -1,6 +1,6 @@
 # Azure Identity client library for Python
 
-The Azure Identity library provides [Microsoft Entra ID](https://learn.microsoft.com/entra/fundamentals/whatis) ([formerly Azure Active Directory](https://learn.microsoft.com/entra/fundamentals/new-name)) token authentication support across the Azure SDK. It provides a set of [`TokenCredential`][token_cred_ref]/[`SupportsTokenInfo`][supports_token_info_ref] implementations, which can be used to construct Azure SDK clients that support Microsoft Entra token authentication.
+The Azure Identity library provides [Microsoft Entra ID](https://learn.microsoft.com/entra/fundamentals/whatis) token-based authentication support across the Azure SDK. It provides a set of [`TokenCredential`][token_cred_ref]/[`SupportsTokenInfo`][supports_token_info_ref] implementations, which can be used to construct Azure SDK clients that support Microsoft Entra token authentication.
 
 [Source code](https://github.com/Azure/azure-sdk-for-python/blob/main/sdk/identity/azure-identity)
 | [Package (PyPI)](https://pypi.org/project/azure-identity/)