- removed an old comment that no longer applied to the code in question.

The interpolator had been changed long ago to use proper GC tracking, so interpolations only can get collected if they had been fully orphaned.
This comment was the main reason why the design flaw in this code never got fixed until recently.

src/r_data/r_interpolate.cpp

@@ -172,20 +172,6 @@ IMPLEMENT_CLASS(DSectorScrollInterpolation, false, false)
 IMPLEMENT_CLASS(DWallScrollInterpolation, false, false)
 IMPLEMENT_CLASS(DPolyobjInterpolation, false, false)
 
-//==========================================================================
-//
-// Important note:
-// The linked list of interpolations and the pointers in the interpolated
-// objects are not processed by the garbage collector. This is intentional!
-//
-// If an interpolation is no longer owned by any thinker it should
-// be destroyed even if the interpolator still has a link to it.
-//
-// When such an interpolation is destroyed by the garbage collector it
-// will automatically be unlinked from the list.
-//
-//==========================================================================
-
 //==========================================================================
 //
 //