Update comment

ScriptableRenderPipeline/HDRenderPipeline/HDRP/Material/DiffusionProfile/DiffusionProfileSettings.cs

         [ColorUsage(false, true)]
         public Color            scatteringDistance;         // Per color channel (no meaningful units)
         [ColorUsage(false, true)]
-        public Color            transmissionTint;           // Color, 0 to 1
+        public Color            transmissionTint;           // HDR color
         public TexturingMode    texturingMode;
         public TransmissionMode transmissionMode;
         public Vector2          thicknessRemap;             // X = min, Y = max (in millimeters)