Include documentation about what each property does

Author: lfrancke

docs/modules/nifi/pages/troubleshooting/index.adoc

@@ -84,8 +84,12 @@ nodes:
       nifi.web.https.sni.host.check: "false"
 ----
 
-WARNING: Disabling SNI validation reduces security by allowing connections with mismatched hostnames.
-Only use this workaround when proper certificate configuration is not feasible.
+These properties control NiFi's SNI validation behavior:
+
+* `nifi.web.https.sni.required`: When `true`, NiFi requires that HTTPS requests include an SNI certificate. Setting to `false` allows connections without SNI certificates.
+* `nifi.web.https.sni.host.check`: When `true`, NiFi validates that the SNI certificate's hostname matches the incoming request's hostname. Setting to `false` disables this hostname matching check.
+
+WARNING: Disabling SNI validation reduces security by allowing connections with mismatched hostnames. Only use this workaround when proper certificate configuration is not feasible.
 
 == `authorization_request_not_found` when using multiple NiFi nodes