[docs] Set Doxygen extract_all to true and fix Doxygen failures (#3695)

The template argument order for UnscentedTransform was reversed to match
all the other UKF classes. Since UnscentedTransform is intended as a
class for internal use only, this shouldn't cause much breakage.

wpiutil/src/main/native/include/wpi/Synchronization.h

@@ -580,7 +580,6 @@ int WPI_WaitForObjectsTimeout(const WPI_Handle* handles, int handles_count,
  * @param handle handle
  * @param manual_reset true for manual reset, false for automatic reset
  * @param initial_state true to make the handle initially in signaled state
- * @return Event handle
  */
 void WPI_CreateSignalObject(WPI_Handle handle, int manual_reset,
                             int initial_state);