First step of comment style refactoring to doxygen-style.

src/server/game/Movement/Spline/MoveSpline.cpp

@@ -151,7 +151,7 @@ void MoveSpline::init_spline(const MoveSplineInitArgs& args)
         spline.initLengths(init);
     }
 
-    // TODO: what to do in such cases? problem is in input data (all points are at same coords)
+    /// @todo what to do in such cases? problem is in input data (all points are at same coords)
     if (spline.length() < minimal_duration)
     {
         sLog->outError(LOG_FILTER_GENERAL, "MoveSpline::init_spline: zero length spline, wrong input data?");