docs: remove old provider property

website/docs/index.html.markdown

@@ -205,10 +205,6 @@ For some advanced scenarios, such as where more granular permissions are necessa
 
 ~> **Note:** The Files Storage API does not support authenticating via AzureAD and will continue to use a SharedKey when AAD authentication is enabled.
 
-* `use_msal` - (Optional) When `true`, and when using service principal authentication, the provider will obtain [v2 authentication tokens](https://docs.microsoft.com/azure/active-directory/develop/access-tokens#token-formats-and-ownership) from the Microsoft Identity Platform. Has no effect when authenticating via Managed Identity or the Azure CLI. Can also be set via the `ARM_USE_MSAL` or `ARM_USE_MSGRAPH` environment variables.
-
--> **Note:** This will behaviour will be defaulted on in version 3.0 of the AzureRM (with no opt-out) due to [the deprecation of Azure Active Directory Graph](https://docs.microsoft.com/azure/active-directory/develop/msal-migration).
-
 It's also possible to use multiple Provider blocks within a single Terraform configuration, for example, to work with resources across multiple Subscriptions - more information can be found [in the documentation for Providers](https://www.terraform.io/docs/configuration/providers.html#multiple-provider-instances).
 
 ## Features