Identity readme updates (Azure#24645)

Author: christothes

sdk/identity/Azure.Identity/README.md

@@ -34,8 +34,6 @@ Developers using Visual Studio Code can use the [Azure Account Extension](https:
 
 To authenticate in Visual Studio Code, first ensure the [Azure Account Extension](https://marketplace.visualstudio.com/items?itemName=ms-vscode.azure-account) is installed. Once the extension is installed, press `F1` to open the command palette and run the `Azure: Sign In` command.
 
-![Visual Studio Code Account Sign In][vs_code_login_image]
-
 #### Authenticating via the Azure CLI
 Developers coding outside of an IDE can also use the [Azure CLI][azure_cli] to authenticate. Applications using the `DefaultAzureCredential` or the `AzureCliCredential` can then use this account to authenticate calls in their application when running locally.
 
@@ -272,6 +270,12 @@ This ensures that the recommendation of reusing credential instances is always s
 Many of the client libraries listed [here](https://azure.github.io/azure-sdk/releases/latest/dotnet.html) support authenticating with `TokenCredential` and the Azure Identity library.
 There you will also find links where you can learn more about their use, including additional documentation and samples.
 
+### Known Issues
+
+This library does not currently support scenarios relating to the [AAD B2C](https://docs.microsoft.com/azure/active-directory-b2c/overview) service.
+
+Currently open issues for the Azure.Identity library can be found [here](https://github.com/Azure/azure-sdk-for-net/issues?q=is%3Aissue+is%3Aopen+label%3AAzure.Identity).
+
 ## Contributing
 This project welcomes contributions and suggestions. Most contributions require you to agree to a Contributor License Agreement (CLA) declaring that you have the right to, and actually do, grant us the rights to use your contribution. For details, visit https://cla.microsoft.com.
 
@@ -299,7 +303,6 @@ This project has adopted the [Microsoft Open Source Code of Conduct][code_of_con
 [azure_core_library]: https://github.com/Azure/azure-sdk-for-net/tree/main/sdk/core/Azure.Core
 [identity_api_docs]: https://docs.microsoft.com/dotnet/api/azure.identity?view=azure-dotnet
 [vs_login_image]: https://raw.githubusercontent.com/Azure/azure-sdk-for-net/main/sdk/identity/Azure.Identity/images/VsLoginDialog.png
-[vs_code_login_image]: https://raw.githubusercontent.com/Azure/azure-sdk-for-net/main/sdk/identity/Azure.Identity/images/VsCodeLoginCommand.png
 [azure_cli_login_image]: https://raw.githubusercontent.com/Azure/azure-sdk-for-net/main/sdk/identity/Azure.Identity/images/AzureCliLogin.png
 [azure_cli_login_device_code_image]: https://raw.githubusercontent.com/Azure/azure-sdk-for-net/main/sdk/identity/Azure.Identity/images/AzureCliLoginDeviceCode.png
 [default_azure_credential_authflow_image]: https://raw.githubusercontent.com/Azure/azure-sdk-for-net/main/sdk/identity/Azure.Identity/images/DefaultAzureCredentialAuthenticationFlow.png