United States Core Data for Interoperability (USCDI) requires a patient suffix and previous patient name

it was not addressed when drafting the updates to US Core

It is defined in the final documentation here: https://www.healthit.gov/isa/sites/isa/files/2020-03/USCDI-Version1-2020-Final-Standard.pdf

Add guidance for representing patient name suffix and previous patient name to the [US Core Patient Profile](StructureDefinition-us-core-patient.html#mandatory-and-must-support-data-elements) using the elements

suffix --> Patient.name.suffix
previous name --> Patient.name.period
update narrative and examples to reflect changes

pre-applied in current build