Add note about disk name

plugins/kernel_v2/config/disk.rb

@@ -17,6 +17,15 @@ module VagrantPlugins
       #
       # TODO: Should probably default to a string+short integer id in the finalize method
       #
+      # Sometihng like:
+      #
+      # - `vagrant_short_id`
+      #
+      # Where short_id is calculated from the disks ID
+      #
+      # Finalize method in `Config#VM` might need to ensure there aren't colliding disk names?
+      # It might also depend on the provider
+      #
       # @return [String]
       attr_accessor :name