Fixed avatar-shaders reference link

Author: towneh

docs/avatars.mdx

@@ -55,7 +55,7 @@ If you place your content within a new directory "Assets > _UserContent" the def
 
 ## Materials/Shaders
 - You can jump straight in with the Universal Render Pipeline/Lit shader that comes with Unity 6
-- Otherwise, we have compiled a list of compatible [Avatar Shaders](avatar-shaders) that you can use.
+- Otherwise, we have compiled a list of compatible [Avatar Shaders](/docs/avatar-shaders) that you can use.
 
 ## Basis Avatar Setup
 - The steps above should automatically add an Animator component to your Avatar prefab when you pull it into the Scene.