Add preview doc to nodes A-C. (#7805)

* Add preview doc to nodes A-C.

* Add preview doc to nodes D

* Add preview doc to nodes E

* Add preview doc to nodes F-H

* iAdd preview doc to nodes I-L

* Add preview doc to node (all others)

* Fix NormalFromTexture from PR review

Author: brett-groshong

com.unity.sg2/Editor/GraphDeltaRegistry/FunctionDefinitions/StandardDefinitions/Artistic/Adjustment/ContrastNode.cs

@@ -54,6 +54,7 @@ internal class ContrastNode : IStandardNode
             displayName : "Contrast",
             tooltip: "Make the darks darker and the brights brighter.",
             category: "Artistic/Adjustment",
+            description: "pkg://Documentation~/previews/Contrast.md",
             synonyms: new string[1] { "intensity" },
             selectableFunctions: new()
             {

com.unity.sg2/Editor/GraphDeltaRegistry/FunctionDefinitions/StandardDefinitions/Artistic/Adjustment/HueNode.cs

@@ -1,4 +1,4 @@
-using System.Collections.Generic;
+using System;
 using Usage = UnityEditor.ShaderGraph.GraphDelta.GraphType.Usage;
 
 namespace UnityEditor.ShaderGraph.Defs
@@ -101,7 +101,8 @@ internal class HueNode : IStandardNode
             Name,
             tooltip: "Changes the hue of a color.",
             category: "Artistic/Adjustment",
-            synonyms: new string[0] {  },
+            synonyms: Array.Empty<string>(),
+            description: "pkg://Documentation~/previews/Hue.md",
             selectableFunctions: new()
             {
                 { "Degrees", "Degrees" },

com.unity.sg2/Editor/GraphDeltaRegistry/FunctionDefinitions/StandardDefinitions/Artistic/Adjustment/ReplaceColorNode.cs

@@ -1,3 +1,4 @@
+using System;
 using Usage = UnityEditor.ShaderGraph.GraphDelta.GraphType.Usage;
 
 namespace UnityEditor.ShaderGraph.Defs
@@ -27,7 +28,8 @@ internal class ReplaceColorNode : IStandardNode
             displayName: "Replace Color",
             tooltip: "Converts the chosen color from an input to another color value.",
             category: "Artistic/Adjustment",
-            synonyms: new string[0],
+            synonyms: Array.Empty<string>(),
+            description: "pkg://Documentation~/previews/ReplaceColor.md",
             parameters: new ParameterUIDescriptor[6]
             {
                 new ParameterUIDescriptor(

com.unity.sg2/Editor/GraphDeltaRegistry/FunctionDefinitions/StandardDefinitions/Artistic/Adjustment/SaturationNode.cs

@@ -1,3 +1,4 @@
+using System;
 using Usage = UnityEditor.ShaderGraph.GraphDelta.GraphType.Usage;
 
 namespace UnityEditor.ShaderGraph.Defs
@@ -31,7 +32,8 @@ internal class SaturationNode : IStandardNode
             displayName: "Saturation",
             tooltip: "Adjusts the color intensity.",
             category: "Artistic/Adjustment",
-            synonyms: new string[0],
+            synonyms: Array.Empty<string>(),
+            description: "pkg://Documentation~/previews/Saturation.md",
             parameters: new ParameterUIDescriptor[3] {
                 new ParameterUIDescriptor(
                     name: "In",

com.unity.sg2/Editor/GraphDeltaRegistry/FunctionDefinitions/StandardDefinitions/Artistic/Adjustment/WhiteBalanceNode.cs

@@ -1,3 +1,4 @@
+using System;
 using Usage = UnityEditor.ShaderGraph.GraphDelta.GraphType.Usage;
 
 namespace UnityEditor.ShaderGraph.Defs
@@ -59,7 +60,8 @@ internal class WhiteBalanceNode : IStandardNode
             displayName: "White Balance",
             tooltip: "adjusts temperature and tint",
             category: "Artistic/Adjustment",
-            synonyms: new string[0],
+            synonyms: Array.Empty<string>(),
+            description: "pkg://Documentation~/previews/WhiteBalance.md",
             parameters: new ParameterUIDescriptor[4] {
                 new ParameterUIDescriptor(
                     name: "In",

com.unity.sg2/Editor/GraphDeltaRegistry/FunctionDefinitions/StandardDefinitions/Artistic/Blend/BlendNode.cs

@@ -319,6 +319,7 @@ internal class BlendNode : IStandardNode
             tooltip: "mixes a base and blend color with the selected mode",
             category: "Artistic/Blend",
             synonyms: new string[20] { "burn", "darken", "difference", "dodge", "divide", "exclusion", "hard light", "hard mix", "linear burn", "linear dodge", "linear light", "multiply", "negate", "overlay", "pin light", "screen", "soft light", "subtract", "vivid light", "overwrite" },
+            description: "pkg://Documentation~/previews/Blend.md",
             selectableFunctions: new()
             {
                 { "Burn", "Burn" },

com.unity.sg2/Editor/GraphDeltaRegistry/FunctionDefinitions/StandardDefinitions/Artistic/Filter/DitherNode.cs

@@ -35,6 +35,7 @@ internal class DitherNode : IStandardNode
             tooltip: "converts a grayscale value to a black and white value with a dither pattern",
             category: "Artistic/Filter",
             synonyms: new string[4] { "half tone", "noise", "diffusion", "bayer grid" },
+            description: "pkg://Documentation~/previews/Dither.md",
             parameters: new ParameterUIDescriptor[3] {
                 new ParameterUIDescriptor(
                     name: "In",

com.unity.sg2/Editor/GraphDeltaRegistry/FunctionDefinitions/StandardDefinitions/Artistic/Filter/FadeTransitionNode.cs

@@ -1,3 +1,4 @@
+using System;
 using Usage = UnityEditor.ShaderGraph.GraphDelta.GraphType.Usage;
 
 namespace UnityEditor.ShaderGraph.Defs
@@ -26,7 +27,8 @@ internal class FadeTransitionNode : IStandardNode
             displayName: "Fade Transition",
             tooltip: "Adds noise for variation while a function transitions from on to off in a graph.",
             category: "Artistic/Filter",
-            synonyms: new string[0],
+            synonyms: Array.Empty<string>(),
+            description: "pkg://Documentation~/previews/FadeTransition.md",
             parameters: new ParameterUIDescriptor[4] {
                 new ParameterUIDescriptor(
                     name: "NoiseValue",

com.unity.sg2/Editor/GraphDeltaRegistry/FunctionDefinitions/StandardDefinitions/Artistic/Mask/ColorMaskNode.cs

@@ -28,6 +28,7 @@ internal class ColorMaskNode : IStandardNode
             tooltip: "Creates a mask where the input values match the selected color.",
             category: "Artistic/Mask",
             synonyms: new string[1] { "intensity" },
+            description: "pkg://Documentation~/previews/ColorMask.md",
             parameters: new ParameterUIDescriptor[5] {
                 new ParameterUIDescriptor(
                     name: "In",

com.unity.sg2/Editor/GraphDeltaRegistry/FunctionDefinitions/StandardDefinitions/Artistic/Normal/NormalBlendNode.cs

@@ -76,7 +76,8 @@ internal class NormalBlendNode : IStandardNode
             category: "Artistic/Normal",
             synonyms: new string[5] { "RNM", "whiteout", "blend", "mix", "combine" },
             displayName: "Normal Blend",
-            selectableFunctions: new()
+            description: "pkg://Documentation~/previews/NormalBlend.md",
+            selectableFunctions: new Dictionary<string, string>
             {
                 { "Default", "Whiteout" },
                 { "Reoriented", "Reoriented" },