Removed doxygen-style comments in Actuator.cpp and kept only internal comments.
Removed doxygen-style comments in Actuator.cpp and kept only internal comments.

opensim-org/opensim-core,opensim-org/opensim-core,opensim-org/opensim-core,opensim-org/opensim-core,opensim-org/opensim-core,opensim-org/opensim-core,opensim-org/opensim-core