added note about only TLS 1.2 is supported (#3213)

param-docs/parameter-pages/MQTT/CACert.md

@@ -16,3 +16,6 @@ Usually there is a common RootCA certificate for the MQTT broker
 
 !!! Note
     This also means that you might have to change the protocol and port in [uri](https://jomjol.github.io/AI-on-the-edge-device-docs/Parameters/#parameter-uri) to `mqtts://example.com:8883`!
+
+!!! Note
+    Only TLS 1.2 is supported!

param-docs/parameter-pages/MQTT/ClientCert.md

@@ -17,3 +17,6 @@ Usually there is a one pair of Client Certificate/Key for each client that conne
 !!! Note
     If set, `ClientKey` must be set too
     This also means that you might have to change the protocol and port in [uri](https://jomjol.github.io/AI-on-the-edge-device-docs/Parameters/#parameter-uri) to `mqtts://example.com:8883`!
+
+!!! Note
+    Only TLS 1.2 is supported!

param-docs/parameter-pages/MQTT/ClientKey.md

@@ -17,3 +17,6 @@ Usually there is a one pair of Client Certificate/Key for each client that conne
 !!! Note
     If set, `ClientCert` must be set too
     This also means that you might have to change the protocol and port in [uri](https://jomjol.github.io/AI-on-the-edge-device-docs/Parameters/#parameter-uri) to `mqtts://example.com:8883`!
+
+!!! Note
+    Only TLS 1.2 is supported!