Change single scattering albedo defaults to 1

com.unity.render-pipelines.high-definition/HDRP/Lighting/Volumetrics/DensityVolume.cs

     [AddComponentMenu("Rendering/Density Volume", 1100)]
     public class DensityVolume : MonoBehaviour
     {
-        public DensityVolumeParameters parameters = new DensityVolumeParameters(Color.grey, 10.0f, 0.0f);
+        public DensityVolumeParameters parameters = new DensityVolumeParameters(Color.white, 10.0f, 0.0f);
 
         private Texture3D previousVolumeMask = null;
 

com.unity.render-pipelines.high-definition/HDRP/Sky/AtmosphericScattering/VolumetricFog.cs

 {
     public class VolumetricFog : AtmosphericScattering
     {
-        public ColorParameter        albedo       = new ColorParameter(new Color(0.5f, 0.5f, 0.5f));
+        public ColorParameter        albedo       = new ColorParameter(Color.white);
         public MinFloatParameter     meanFreePath = new MinFloatParameter(1000000.0f, 1.0f);
         public ClampedFloatParameter anisotropy   = new ClampedFloatParameter(0.0f, -1.0f, 1.0f);