Adjusting IWA warning message (#406)

* Removing part of a warning that no longer applies.

* Modifying verbosity of 2fa log message.

src/MSALWrapper/AuthFlow/IntegratedWindowsAuthentication.cs

@@ -66,8 +66,7 @@ protected override async Task<TokenResult> GetTokenInnerAsync()
                 ex.Classification == UiRequiredExceptionClassification.BasicAction
                 && ex.Message.StartsWith("AADSTS50076", StringComparison.OrdinalIgnoreCase))
             {
-                this.logger.LogWarning("Warning: IWA failed, 2FA is required.");
-                this.logger.LogWarning("Warning: IWA can pass this requirement if you log into Windows with either a Smart Card or Windows Hello.");
+                this.logger.LogDebug("IWA failed, 2FA is required.");
                 throw;
             }
             catch (MsalClientException ex) when (ex.Message.Contains("WS-Trust endpoint not found"))