Update device-integrity.md

@freddy-m #2315 (review)

docs/device-integrity.md

@@ -7,6 +7,10 @@ cover: device-integrity.webp
 
 These tools can be used to validate the integrity of your mobile devices and check them for indicators of compromise by spyware and malware such as Pegasus, Predator, or KingsPawn. This page focuses on **mobile security**, because mobile devices typically have read-only systems with well-known configurations, so detecting malicious modifications is easier than on traditional desktop systems. We may expand the focus of this page in the future.
 
+!!! note "This is an advanced topic"
+
+    These tools may provide utility for certain individuals. They provide functionality which most people do not need to worry about, and often require more in-depth technical knowledge to utilize effectively.
+
 It is **critical** to understand that scanning your device for public indicators of compromise is **not sufficient** to determine that a device is "clean", and not targeted with a particular spyware tool. Reliance on these publicly-available scanning tools can miss recent security developments and give you a false sense of security.
 
 ## General Advice