Added a help box to inform users of the potential dependency to directional lights when baking. (#6059)

* Added a help box to inform users of the potential dependency to directional lights when baking.

* Update changelog

* Update CHANGELOG.md

* Updated message box.

Co-authored-by: sebastienlagarde <sebastien@unity3d.com>

Author: JulienIgnace-Unity

com.unity.render-pipelines.high-definition/CHANGELOG.md

@@ -71,6 +71,7 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
 - Depth of Field is now disabled in orthographic cameras - it was using the hidden perspective settings (case 1372582).
 - Modified HDRP to use common FSR logic from SRP core.
 - Optimized FSR by merging the RCAS logic into the FinalPass shader.
+- Integrate a help box to inform users of the potential dependency to directional lights when baking.
 
 ## [13.1.0] - 2021-09-24
 

com.unity.render-pipelines.high-definition/Editor/Sky/HDLightingWindowEnvironmentSection.cs

@@ -200,6 +200,8 @@ void DrawGUI()
 
                 EditorGUILayout.PropertyField(m_SerializedActiveSceneLightingSky.volumetricCloudsToggle, EditorGUIUtility.TrTextContent("Static Lighting Volumetric Clouds", "Specify if volumetric clouds should be used for static ambient in the referenced profile for active scene."));
 
+                EditorGUILayout.HelpBox("The interaction between the Scene Volume sky type and the Scene's dominant directional light may affect the visual characteristics of this bake.", MessageType.Info);
+
                 --EditorGUI.indentLevel;
             }
         }