Validate 2.1b sample files against the 2.1 final changes and update accordingly

Summary of outcomes for Data Standard 2.1

• Problem Addressed: Sample data files no longer validate following updates made for 2.1 final.
• High-level Reasoning: Sample data should be updated to appropriately reflect changes made for 2.1 final.
• Changes Made: Updated sample xml files to validate against updated schema

Original ticket description follows:

Validate 2.1b sample files against the 2.1 final changes and update sample data accordingly to prepare it for publication with the 2.1 standard.