message: List all possible environment variables EnvironmentCredential reads, or may ever read from
diff: @@ -23,6 +23,14 @@ namespace Azure { namespace Identity {
  public:
  /**
  * Constructs an environment credential.
  + *
  + * @details May read from the following environment variables:
  + * - AZURE_TENANT_ID
  + * - AZURE_CLIENT_ID
  + * - AZURE_CLIENT_SECRET
  + * - AZURE_CLIENT_CERTIFICATE_PATH
  + * - AZURE_USERNAME
  + * - AZURE_PASSWORD
  */
  explicit EnvironmentCredential();
  