Update how-to-troubleshoot-online-endpoints.md

Author: Mutilar

articles/machine-learning/how-to-troubleshoot-online-endpoints.md

@@ -191,7 +191,7 @@ There are two supported tracing headers:
    > [!Note]
    > When you create a support ticket for a failed request, attach the failed request ID to expedite investigation.
    
-- `x-ms-client-request-id` is available for client tracing scenarios. We sanitize this header to remove non-alphanumeric symbols. This header is truncated to 72 characters.
+- `x-ms-client-request-id` is available for client tracing scenarios. We sanitize this header to remove non-alphanumeric symbols. This header is truncated to 40 characters.
 
 ## Common deployment errors