Update Environment Lighting doc (#7008)

The Static Lighting Volumetric Clouds option is missing from the Environment Lighting page. In this PR, I add information about that option. I also added  a note about the impact of the dominant directional light on the scene based on a tooltip Julien Ignace added to the UI in #6059. Based on official docs guidance regarding maintainability (https://unity-docs.gitbook.io/style-guide/format/images/screenshots), I have also removed the screenshot of the menu.

Author: ValGrimm-U3D

com.unity.render-pipelines.high-definition/Documentation~/Environment-Lighting.md

@@ -36,15 +36,15 @@ HDRP also allows you to implement your own sky types that display a background a
 
 The **Environment (HDRP)** is a section in the [Lighting window](https://docs.unity3d.com/Manual/lighting-window.html) that allows you to specify which sky to use for indirect ambient light in HDRP. To open the window, select **Window > Rendering > Lighting > Environment**.
 
-![](Images/EnvironmentLighting1.png)
-
 The **Environment (HDRP)** section is at the top and has two settings that you can edit:
 
 | **Setting**             | **Description**                                              |
 | ----------------------- | ------------------------------------------------------------ |
-| **Profile**             | A [Volume Profile](Volume-Profile.md) for the sky. This Volume Profile must include at least one Sky Volume override. |
+| **Profile**             | A [Volume Profile](Volume-Profile.md) for the sky. This Volume Profile must include at least one Sky Volume override. The interaction between the Volume Profile and the Scene's dominant directional light may affect the visual characteristics of baked light in the Scene. |
 | **Static Lighting Sky** | The sky to use for the indirect ambient light simulation. The drop-down only contains sky types that the **Profile** includes. For example, if the **Profile** includes a **Gradient Sky** Volume override, you can select **Gradient Sky** from this drop-down.<br/>You can only edit this setting if you assign a Volume Profile to the **Profile** field. |
 | **Static Lighting Clouds** | The clouds to use for the indirect ambient light simulation. The drop-down only contains cloud types that the **Profile** includes.<br/>You can only edit this setting if you assign a Volume Profile to the **Profile** field. |
+| **Static Lighting Volumetric Clouds** | Enable this option to include Volumetric Clouds in the indirect ambient light simulation. |
+
 
 You can assign the same Volume Profile to both the **Static Lighting Sky** field and a [Volume](Volumes.md) in your Scene. If you do this, and use the same sky settings for the baked lighting and the visual background in the Volume, the baked lighting accurately matches the background at runtime. If you want to control the light baking for the environment lighting separately to the visual background in your Scene, you can assign a different Volume Profile for each process.