Sg/shadergraph preferences page

com.unity.shadergraph/Documentation~/Shader-Graph-Preferences.md

@@ -0,0 +1,9 @@
+# Shader Graph Preferences
+
+To access the Shader Graph Project-wide settings, click **Edit** > **Preferences**, and then select **Shader Graph**.
+
+## Settings
+
+| Name | Description |
+|:------- |:----------- |
+|Shader Variant Limit| Enter a value to set the maximum number of shader variants. If your graph exceeds this maximum value, Unity throws the following error: _Validation: Graph is generating too many variants. Either delete Keywords, reduce Keyword variants or increase the Shader Variant Limit in Preferences > Shader Graph._ For more information about shader variants, see [Making multiple shader program variants](https://docs.unity3d.com/Manual/SL-MultipleProgramVariants.html). |

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

@@ -11,6 +11,7 @@
     * [Color Modes](Color-Modes)
     * [Precision Modes](Precision-Modes)
     * [Custom Function Node](Custom-Function-Node)
+    * [Shader Graph Preferences](Shader-Graph-Preferences)
     * [Samples](ShaderGraph-Samples.md)
 * Inside Shader Graph  
     * [Shader Graph Asset](Shader-Graph-Asset)