Remove unnecessary comments that were causing a warning with Clang.

ScapulothoracicJoint.h

@@ -49,10 +49,7 @@ OpenSim_DECLARE_CONCRETE_OBJECT(ScapulothoracicJoint, Joint);
 //=============================================================================
 // PROPERTIES
 //=============================================================================
- /** @name Property declarations 
- The serializable properties associated with a ScapulothoracicJoint.
- /**@{**/
- OpenSim_DECLARE_PROPERTY(thoracic_ellipsoid_radii_x_y_z, SimTK::Vec3, 
+ OpenSim_DECLARE_PROPERTY(thoracic_ellipsoid_radii_x_y_z, SimTK::Vec3,
  "Radii of the thoracic surface ellipsoid a Vec3(rX, rY, rZ).");
 
  OpenSim_DECLARE_LIST_PROPERTY_SIZE(scapula_winging_axis_origin, double, 2,
@@ -61,7 +58,6 @@ OpenSim_DECLARE_CONCRETE_OBJECT(ScapulothoracicJoint, Joint);
 
  OpenSim_DECLARE_PROPERTY(scapula_winging_axis_direction, double, 
  "Winging axis orientation (in radians) in the scapula plane.");
- /**@}**/
  /** Indices of Coordinates for use as arguments to getCoordinate() and
  updCoordinate().