FlightTaskStraightLine: add descriptions for defines

src/lib/FlightTasks/tasks/Utility/StraightLine.cpp

@@ -39,8 +39,8 @@
 #include <mathlib/mathlib.h>
 #include <float.h>
 
-#define VEL_ZERO_THRESHOLD 0.001f
-#define DECELERATION_MAX 8.0f
+#define VEL_ZERO_THRESHOLD 0.001f // Threshold to compare if the target velocity is zero
+#define DECELERATION_MAX 8.0f     // The vehicles maximum deceleration TODO check to create param
 
 using namespace matrix;