Update Light Anchor page (#6955)

* Updated Light Anchor to match Core RP page

* added light anchor page to ToC

* Update light-anchor.md

Author: emilybrown1

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

@@ -132,6 +132,7 @@
       * [Planar Reflection Probe](Planar-Reflection-Probe.md)
       * [Reflection Proxy Volume](Reflection-Proxy-Volume.md)
   * [Light](Light-Component.md)
+  * [Light Anchor](light-anchor.md)
   * [Environment Lighting](Environment-Lighting.md)
   * [Clouds in HDRP](clouds-in-hdrp.md)
   * [Atmospheric Scattering](Atmospheric-Scattering.md)

com.unity.render-pipelines.high-definition/Documentation~/light-anchor.md

@@ -1,21 +1,41 @@
-# Light Anchor
+## Light Anchor
 
-![](Images/LightAnchor0.png)
+The Light Anchor can help to place light sources around subjects, in relation to a Camera and an anchor point. It's particularly effective for cinematic lighting, which often requires multiple light sources orbiting a subject.
+
+## Using the Light Anchor Component
+
+To add a Light Anchor component to a GameObject in your Scene:
+
+1. Select a Light GameObject in the hierarchy to open its Inspector window.
+2. Go to **Add Component** > **Rendering** > **Light Anchor**
+
+By default, the Anchor's position is the same as the position of the GameObject the Light Anchor Component is attached to.
+
+**Note**: To use the Light Anchor, you must set the Tag of at least one Camera to "MainCamera".
 
-You can use a Light Anchor to light a scene in rendered Camera Space. You can also make the Light move and rotate to match your lighting set up. To do this, attach a [Transform](https://docs.unity3d.com/ScriptReference/Transform.html) to the Light Anchor in the **Anchor Position Override** field.
+Use the **Orbit** and **Elevation** to control the orientation of the light, in degrees, relative to the main Camera's and Anchor's positions. If the Light has a Cookie or an IES Profile, use the **Roll** to change their orientation. Use the **Distance** to control how far from the anchor, in meters, you want to place the Light.
+
+You can use the **Anchor Position Override** to provide a GameObject’s [Transform](https://docs.unity3d.com/ScriptReference/Transform.html) as an anchor point for the Light. This is useful if you want the Light to follow a specific GameObject in the Scene.
 
 ![](Images/LightAnchorAnimation.gif)
 
-**Note:** The reference Camera that adjusts the light rotation in the above example is the Main Camera. This means that the Common presets can create a different result in the Scene View if your view is not aligned with the Main Camera.
+**Note**: The above example uses the Main Camera as the reference Camera that adjusts the light rotation. The Common presets might create a different result in the Scene View if your view isn't aligned with the Main Camera.
+
+You can set a **Position Offset** for this custom Anchor. This is useful if the Transform position of the custom Anchor isn't centered appropriately for the light to orbit correctly around the custom Anchor.
+
+![](Images/LightAnchor0.png)
+
+
+The Light Anchor component also includes a list of **Presets** that you can use to set the Light's orientation relative to the main Camera.
 
 ## Properties
 
 | **Property**    | **Description**                                              |
 | --------------- | ------------------------------------------------------------ |
-| Orbit | Use the left icon to control the Orbit of the light. This tool becomes green when you move the icon. |
-| Elevation | Use the middle icon to control the Elevation of the light. This tool becomes blue when you move the icon. |
-| Roll | Use the right icon to control the Rollof the light. This tool becomes gray when you move the icon. This is especially useful if the light has an IES or a Cookie. |
-| Distance | Controls the distance between the light and its anchor in world space. |
-| Up Direction | Defines the space of the up direction of the anchor. When this value is set to Local, the Up Direction is relative to the camera. |
-| Anchor Position Override | Allows you to use a GameObject's [Transform](https://docs.unity3d.com/ScriptReference/Transform.html) as anchor position instead of the LightAnchor's Transform. When the Transform of the GameObject you assigned to this property changes, the Light Anchor's Transform also changes. |
-| Common | Assigns a preset to the light component based on the behaviour of studio lights. |
+| **Orbit** | Use the left icon to control the Orbit of the light. This tool becomes green when you move the icon. |
+| **Elevation** | Use the middle icon to control the Elevation of the light. This tool becomes blue when you move the icon. |
+| **Roll** | Use the right icon to control the Roll of the light. This tool becomes gray when you move the icon. This is useful if the light has an IES or a Cookie. |
+| **Distance** | Controls the distance between the light and its anchor in world space. |
+| **Up Direction** | Defines the space of the up direction of the anchor. When you set this value to Local, the Up Direction is relative to the Camera. |
+| **Anchor Position Override** | Allows you to use a GameObject's [Transform](https://docs.unity3d.com/ScriptReference/Transform.html) as anchor position instead of the LightAnchor's Transform. When the Transform of the GameObject you assigned to this property changes, the Light Anchor's Transform also changes. |
+| **Common** | Assigns a preset to the light component based on the behavior of studio lights. |