Refreshed mfa include file (#3654)

Author: mikefrobbins

includes/mfa-requirement.md

@@ -4,6 +4,11 @@ ms.custom: devx-track-azurepowershell
 ---
 
 > [!IMPORTANT]
-> Beginning in early 2025, authenticating to Azure from Azure PowerShell using a Microsoft Entra ID
-> user identity will require multifactor authentication (MFA). For more information, see
-> [**The impact of multifactor authentication on Azure PowerShell in automation scenarios**](https://aka.ms/azps-mfa).
+> Starting in September 2025, Azure PowerShell will require multifactor authentication (MFA) when
+> signing in with a Microsoft Entra ID user identity. This change enhances security but might affect
+> automation workflows that rely on username and password authentication. For more information, see
+> [**The impact of multifactor authentication on Azure PowerShell in automation scenarios**][01].
+
+<!-- link references -->
+
+[01]: https://aka.ms/azps-mfa