The information it's pulling to add the contacts from Facebook is information that your friends on Facebook have made accessible to you as their friend. Only they can edit or change that information and you cannot add to or reduce that information. I believe your only option is to, and this is going to sound like a lot of work, is to create a contact for that person with the edits you want and then link the two contacts. That will cause any anniversaries, birthdays, location information, phone numbers or email addresses sync between the information they are offering to their friends and the information you personally have about them. Alternatively you could request that they update their shared information to include the information you would like displayed, however this would cause their information to be updated to all of their friends and they may not be up for that. However the linked information offers you some options for example you can choose to use their profile pic or one of your own, you will still be able to choose a primary phone # or email so that those are the first to pop up when calling or emailing, and you will be able to choose between the contact name you created or the name they display on Facebook.