Fixes typo in FileCopier documentation
Fixes typo in FileCopier documentation

DAB0mB/velocity,meteor-velocity/velocity,pbastowski/velocity,meteor-velocity/velocity,markandrewj/velocity-test-runner,markandrewj/velocity-test-runner,pbastowski/velocity,DAB0mB/velocity,markandrewj/velocity-test-runner,pbastowski/velocity,aldeed/velocity,meteor-velocity/velocity,DAB0mB/velocity