Update HDR docs (#6191)

Author: FrancescoC-unity

com.unity.render-pipelines.high-definition/Runtime/PostProcessing/Components/Tonemapping.cs

@@ -90,6 +90,9 @@ public enum FallbackHDRTonemap
         ACES
     }
 
+    /// <summary>
+    /// A <see cref="VolumeParameter"/> that holds a <see cref="NeutralRangeReductionMode"/> value.
+    /// </summary>
     [Serializable]
     public sealed class NeutralRangeReductionModeParameter : VolumeParameter<NeutralRangeReductionMode>
     {
@@ -101,6 +104,9 @@ public sealed class NeutralRangeReductionModeParameter : VolumeParameter<Neutral
         public NeutralRangeReductionModeParameter(NeutralRangeReductionMode value, bool overrideState = false) : base(value, overrideState) { }
     }
 
+    /// <summary>
+    /// A <see cref="VolumeParameter"/> that holds a <see cref="HDRACESPreset"/> value.
+    /// </summary>
     [Serializable]
     public sealed class HDRACESPresetParameter : VolumeParameter<HDRACESPreset>
     {
@@ -112,6 +118,9 @@ public sealed class HDRACESPresetParameter : VolumeParameter<HDRACESPreset>
         public HDRACESPresetParameter(HDRACESPreset value, bool overrideState = false) : base(value, overrideState) { }
     }
 
+    /// <summary>
+    /// A <see cref="VolumeParameter"/> that holds a <see cref="FallbackHDRTonemap"/> value.
+    /// </summary>
     [Serializable]
     public sealed class FallbackHDRTonemapParameter : VolumeParameter<FallbackHDRTonemap>
     {

com.unity.render-pipelines.high-definition/Runtime/RenderPipeline/HDRenderPipeline.PostProcess.cs

@@ -4098,7 +4098,7 @@ static Vector3 GetColorBalanceCoeffs(float temperature, float tint)
             return new Vector3(w1.x / w2.x, w1.y / w2.y, w1.z / w2.z);
         }
 
-        public static void GetHDROutputParameters(Tonemapping tonemappingComponent, out Vector4 hdrOutputParameters1, out Vector4 hdrOutputParameters2)
+        static void GetHDROutputParameters(Tonemapping tonemappingComponent, out Vector4 hdrOutputParameters1, out Vector4 hdrOutputParameters2)
         {
             var minNits = HDROutputSettings.main.minToneMapLuminance;
             var maxNits = HDROutputSettings.main.maxToneMapLuminance;