Update connect-cef-syslog.md

I have aded "note that the data will be sent twice" because this was unclear to me, and I clarified with the feature PM it is sent twice

Author: mvaladasdemo

articles/sentinel/connect-cef-syslog.md

@@ -42,7 +42,7 @@ Using the same facility for both Syslog and CEF messages may result in data inge
 To avoid this scenario, use one of these methods:
 
 - **If the source device enables configuration of the target facility**: On each source machine that sends logs to the log forwarder in CEF format, edit the Syslog configuration file to remove the facilities used to send CEF messages. This way, the facilities sent in CEF won't also be sent in Syslog. Make sure that each DCR you configure in the next steps uses the relevant facility for CEF or Syslog respectively.
-- **If changing the facility for the source appliance isn't applicable**: Use an ingest time transformation to filter out CEF messages from the Syslog stream to avoid duplication:
+- **If changing the facility for the source appliance isn't applicable**: Use an ingest time transformation to filter out CEF messages from the Syslog stream to avoid duplication (note the data will be sent twice from the collector machine to the workspace):
 
     ```kusto
     source |
@@ -167,4 +167,4 @@ See [examples of facilities and log levels sections](connect-cef-ama.md#examples
 In this article, you learned how to stream and filter logs in both the CEF and Syslog format to your Microsoft Sentinel workspace. To learn more about Microsoft Sentinel, see the following articles:
 - Learn how to [get visibility into your data, and potential threats](get-visibility.md).
 - Get started [detecting threats with Microsoft Sentinel](detect-threats-built-in.md).
-- [Use workbooks](monitor-your-data.md) to monitor your data.
+- [Use workbooks](monitor-your-data.md) to monitor your data.