Remove misleading docs about device ID

Author: horgh

lib/minfraud/model/device.rb

@@ -19,10 +19,7 @@ class Device < Abstract
       attr_reader :confidence
 
       # A UUID that MaxMind uses for the device associated with this IP
-      # address. Note that many devices cannot be uniquely identified because
-      # they are too common (for example, all iPhones of a given model and OS
-      # release). In these cases, the minFraud service will simply not return a
-      # UUID for that device.
+      # address.
       #
       # @return [String, nil]
       attr_reader :id