Minor tweaks and comments

src/shapes.c

@@ -1721,7 +1721,7 @@ Rectangle GetCollisionRec(Rectangle rec1, Rectangle rec2)
 //----------------------------------------------------------------------------------
 
 // Cubic easing in-out
-// NOTE: Required for DrawLineBezier()
+// NOTE: Used by DrawLineBezier() only
 static float EaseCubicInOut(float t, float b, float c, float d)
 {
     if ((t /= 0.5f*d) < 1) return 0.5f*c*t*t*t + b;