If you need to change the document in your Rules & Terms membership field (or Common Field), doing so will not force your members to recheck that field.  

What you need to do is export all your members and change the value in that field to N. and then reimport them. It will not change any other data in your member's information. That way they will have to check the box the next time they access their profile.

See this example of the export file after is is modified and ready for import.