message: Update ChainedTokenCredential sample to use AzureCliCredential
diff: #include <azure/identity/chained_token_credential.hpp>
  +#include <azure/identity/azure_cli_credential.hpp>
  #include <azure/identity/environment_credential.hpp>
  #include <azure/identity/managed_identity_credential.hpp>
  @@ -16,10 +17,12 @@ int main()
  {
  // Step 1: Initialize Chained Token Credential.
  // A configuration demonstrated below would authenticate using EnvironmentCredential if it is
  - // available, and if it is not available, would fall back to use ManagedIdentityCredential.
  + // available, and if it is not available, would fall back to use AzureCliCredential, and then to
  + // ManagedIdentityCredential.
  auto chainedTokenCredential = std::make_shared<Azure::Identity::ChainedTokenCredential>(
  Azure::Identity::ChainedTokenCredential::Sources{
  std::make_shared<Azure::Identity::EnvironmentCredential>(),
  + std::make_shared<Azure::Identity::AzureCliCredential>(),
  std::make_shared<Azure::Identity::ManagedIdentityCredential>()});
  // Step 2: Pass the credential to an Azure Service Client.
  