A message that tells the user where the Shadowmask settings are located.
If SupportedRenderingFeatures.overridesShadowmask has been set to true, the Shadowmask setting will be removed from Quality settings. If it has been moved to a new location, use SupportedRenderingFeatures.overrideShadowmaskMessage to describe where.
This message is used in the Lighting Window when selecting the Shadowmask mode for Mixed lighting, and will tell them where the settings for it are located.