Add clarity to and comments to relationship.updateItem
Add clarity to and comments to relationship.updateItem

* cleared up single item logic flow
* Updated the description
* Added comments to the logic flow

Pop-Code/keystone,matthewstyers/keystone,ratecity/keystone,andrewlinfoot/keystone,danielmahon/keystone,benkroeger/keystone,frontyard/keystone,benkroeger/keystone,naustudio/keystone,naustudio/keystone,concoursbyappointment/keystoneRedux,concoursbyappointment/keystoneRedux,andrewlinfoot/keystone,danielmahon/keystone,trentmillar/keystone,frontyard/keystone,trentmillar/keystone,frontyard/keystone,trentmillar/keystone,ratecity/keystone,matthewstyers/keystone,matthewstyers/keystone,benkroeger/keystone,vokal/keystone,naustudio/keystone,Pop-Code/keystone,andrewlinfoot/keystone,vokal/keystone,danielmahon/keystone,vokal/keystone