Public Api doc improvements for URP, 2D URP and Core

Initiative: https://jira.unity3d.com/browse/RND-205
JIRA card: https://jira.unity3d.com/browse/URP-1152

Currently URP has a lot of missing documentation for public API, over 600 functions, enums, etc. This PR adds minimal documentation to each of those and allows us to enable the "Find missing docs - urp" job on Yamato, preventing future developers from adding public API without documentation.

Packages/com.unity.render-pipelines.core/Runtime/Debugging/DebugDisplaySettingsVolumes.cs

@@ -389,10 +389,7 @@ public bool TryGetScreenClearColor(ref Color color)
             return false;
         }
 
-        /// <summary>
-        /// Creates the panel
-        /// </summary>
-        /// <returns>The panel</returns>
+        /// <inheritdoc/>
         public IDebugDisplaySettingsPanelDisposable CreatePanel()
         {
             return new SettingsPanel(this);

Packages/com.unity.render-pipelines.core/Runtime/RenderPipeline/IShaderVariantSettings.cs

@@ -8,9 +8,11 @@ public enum ShaderVariantLogLevel
         /// <summary>Disable all log for Shader Variant</summary>
         [Tooltip("No shader variants are logged")]
         Disabled,
+
         /// <summary>Only logs SRP Shaders when logging Shader Variant</summary>
         [Tooltip("Only shaders that are compatible with SRPs (e.g., URP, HDRP) are logged")]
         OnlySRPShaders,
+
         /// <summary>Logs all Shader Variant</summary>
         [Tooltip("All shader variants are logged")]
         AllShaders,

Packages/com.unity.render-pipelines.universal/Editor/Converter/Converters.cs

@@ -11,7 +11,14 @@ namespace UnityEditor.Rendering.Universal
     /// <seealso cref="Converters.RunInBatchMode(UnityEditor.Rendering.Universal.ConverterContainerId, List{UnityEditor.Rendering.Universal.ConverterId}, UnityEditor.Rendering.Universal.ConverterFilter)"/>.)
     public enum ConverterFilter
     {
+        /// <summary>
+        /// Use this to include converters matching the filter.
+        /// </summary>
         Inclusive,
+
+        /// <summary>
+        /// Use this to exclude converters matching the filter.
+        /// </summary>
         Exclusive
     }
 
@@ -21,8 +28,19 @@ public enum ConverterFilter
     /// <seealso cref="Converters.RunInBatchMode(UnityEditor.Rendering.Universal.ConverterContainerId)"/>.)
     public enum ConverterContainerId
     {
+        /// <summary>
+        /// Use this for Built-in to URP converter.
+        /// </summary>
         BuiltInToURP,
+
+        /// <summary>
+        /// Use this for Built-in to 2D (URP) converter.
+        /// </summary>
         BuiltInToURP2D,
+
+        /// <summary>
+        /// Use this to upgrade 2D (URP) assets.
+        /// </summary>
         UpgradeURP2DAssets,
     }
 
@@ -32,14 +50,40 @@ public enum ConverterContainerId
     /// <seealso cref="Converters.RunInBatchMode(UnityEditor.Rendering.Universal.ConverterContainerId, List{UnityEditor.Rendering.Universal.ConverterId}, UnityEditor.Rendering.Universal.ConverterFilter)"/>.)
     public enum ConverterId
     {
+        /// <summary>
+        /// Use this for the material converters.
+        /// </summary>
         Material,
+
+        /// <summary>
+        /// Use this for the render settings converters.
+        /// </summary>
         RenderSettings,
+
+        /// <summary>
+        /// Use this for the animation clip converters.
+        /// </summary>
         AnimationClip,
+
+        /// <summary>
+        /// Use this for readonly material converters.
+        /// </summary>
         ReadonlyMaterial,
+
+        /// <summary>
+        /// Use this for post processing V2 converters.
+        /// </summary>
         PPv2,
+
+        /// <summary>
+        /// Use this for parametric to freeform light converters.
+        /// </summary>
         ParametricToFreeformLight,
     }
 
+    /// <summary>
+    /// Class for the converter framework.
+    /// </summary>
     public static class Converters
     {
         static Type GetContainerType(ConverterContainerId containerName)

Packages/com.unity.render-pipelines.universal/Editor/LightExplorer.cs

@@ -5,6 +5,9 @@
 
 namespace UnityEditor
 {
+    /// <summary>
+    /// Editor script for the Lighting Explorer.
+    /// </summary>
     [LightingExplorerExtensionAttribute(typeof(UniversalRenderPipelineAsset))]
     public class LightExplorer : DefaultLightingExplorerExtension
     {
@@ -33,6 +36,7 @@ private static class Styles
             public static readonly int[] ReflectionProbeSizeValues = { 16, 32, 64, 128, 256, 512, 1024, 2048 };
         }
 
+        /// <inheritdoc />
         protected override LightingExplorerTableColumn[] GetReflectionProbeColumns()
         {
             return new[]