fixed typos, added copyright, fixed changelog

CHANGELOG.md

...rollers/dual_arm_cartesian_impedance_example_controller.h

...xample_controllers/scripts/dual_arm_interactive_marker.py

...s/src/dual_arm_cartesian_impedance_example_controller.cpp

franka_hw/include/franka_hw/franka_combinable_hw.h

franka_hw/include/franka_hw/franka_combined_hw.h

franka_hw/include/franka_hw/franka_hw.h

franka_hw/include/franka_hw/services.h

franka_hw/src/franka_combinable_hw.cpp

franka_hw/src/franka_combined_hw.cpp

franka_hw/src/franka_hw.cpp