Address CodeRabbit VNC review feedback

management/server/types/policyrule.go

@@ -89,10 +89,10 @@ type PolicyRule struct {
 	// AuthorizedUser is a list of userIDs that are authorized to access local resources via ssh
 	AuthorizedUser string
 
-	// SessionPubKey is the base64 Ed25519 public key the AuthorizedUser
-	// will sign session-binding challenges with. Set together with
-	// AuthorizedUser when the rule was created via temporary-access for
-	// a VNC scope; empty otherwise.
+	// SessionPubKey is the base64 X25519 public key used with Noise_IK to
+	// bind a VNC session to the AuthorizedUser. Set together with
+	// AuthorizedUser when the rule was created via temporary-access for a
+	// VNC scope; empty otherwise.
 	SessionPubKey string
 }