Task/fix doc (#299)

* Updated **TableOfContents.md**.

* updated what is necessary to urp forward+ in whats-new-0.9.x.md.

Author: H3idi-X

com.unity.toonshader/Documentation~/TableOfContents.md

@@ -2,6 +2,7 @@
 * [Requirements](System-Requirements.md)
 * [Installation](installation.md)
 * [What's new](whats-new.md)
+  * [0.9.x-preview](whats-new-0.9.x.md)
   * [0.8.x-preview](whats-new-0.8.x.md)
   * [0.7.x-preview](whats-new-0.7.x.md)
   * [0.6.x-preview](whats-new-0.6.x.md)

com.unity.toonshader/Documentation~/whats-new-0.9.x.md

@@ -2,6 +2,6 @@
 
 ## Compatibity with URP forward+ 
 
-* From 0.9.0-preview on, The **Unity Toon Shader** is compatible with URP forward+.
+* From 0.9.0-preview on, The **Unity Toon Shader** is compatible with URP forward+. To use this feature, you need to use 2022.2 or later.
 * The minimum Unity version has also change please refer to [Requirements](System-Requirements.md) in the documents.