add note about x86_64 to forwarder documentation (#965)

Author: cswatt

aws/logs_monitoring/README.md

@@ -25,6 +25,8 @@ For more information about sending AWS services logs with the Datadog Forwarder,
 
 Datadog recommends using [CloudFormation](#cloudformation) to automatically install the Forwarder. You can also complete the setup process using [Terraform](#terraform) or [manually](#manual). Once installed, you can subscribe the Forwarder to log sources such as S3 buckets or CloudWatch log groups by [setting up triggers][4].
 
+**Note**: Forwarder v4.1.0+ does not support x86_64 architecture. If you are using x86_64, you must migrate to ARM64 to use the Datadog Forwarder.
+
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 {{% tab "CloudFormation" %}}