added note about superset 2.x multiarch

Author: adwk67

modules/concepts/pages/multi-platform-support.adoc

@@ -10,4 +10,6 @@ WARNING: This status is still experimental, as we work to fine-tune the necessar
 Starting with Stackable release 24.7, all images are {multi-platform-images}[multi-platform images], supporting the AMD64 and ARM64 architectures.
 Each product image is built for each platform with a specific tag.
 These tags are then bundled as a manifest list using an automated workflow so that the appropriate image can be transparently selected for the active platform/architecture.
-This also enables mixed Kubernetes clusters, with amd64 and arm64 nodes being used simultaneously.
+This also enables mixed Kubernetes clusters, with AMD64 and ARM64 nodes being used simultaneously.
+
+NOTE: Superset 2.x (deprecated, and to be removed in a future version) is not available as a multi-platform product image.