Update some comments in Enterprise and OrderCycle models

app/models/enterprise.rb

@@ -94,10 +94,8 @@ class Enterprise < ActiveRecord::Base
       select('DISTINCT enterprises.*')
   }
   scope :not_ready_for_checkout, lambda {
-    # When ready_for_checkout is empty, ActiveRecord generates the SQL:
-    # id NOT IN (NULL)
-    # I would have expected this to return all rows, but instead it returns none. But we want to
-    # return all rows when there are no enterprises ready for checkout.
+    # When ready_for_checkout is empty, return all rows when there are no enterprises ready for
+    # checkout.
     ready_enterprises = Enterprise.ready_for_checkout
     ready_enterprises.present? ? where("id NOT IN (?)", ready_enterprises) : where("TRUE")
   }

app/models/order_cycle.rb

@@ -9,7 +9,7 @@ class OrderCycle < ActiveRecord::Base
   has_many :exchanges, :dependent => :destroy
 
   # These scope names are prepended with "cached_" because there are existing accessor methods
-  # :incoming_exchanges and :outgoing_exchanges. Future work can be done to name these properly.
+  # :incoming_exchanges and :outgoing_exchanges.
   has_many :cached_incoming_exchanges, conditions: { incoming: true }, class_name: "Exchange"
   has_many :cached_outgoing_exchanges, conditions: { incoming: false }, class_name: "Exchange"
 
@@ -18,9 +18,6 @@ class OrderCycle < ActiveRecord::Base
 
   has_and_belongs_to_many :schedules, join_table: 'order_cycle_schedules'
 
-  # TODO: DRY the incoming/outgoing clause used in several cases below
-  # See Spree::Product definition, scopes variants and variants_including_master
-  # This will require these accessors to be renamed
   attr_accessor :incoming_exchanges, :outgoing_exchanges
 
   validates_presence_of :name, :coordinator_id