[css-scroll-snap] Add issue about removing 2d snapping

Author: tabatkins

css-scroll-snap/Overview.bs

@@ -783,6 +783,10 @@ Types of Scrolling Methods {#scroll-types}
 Axis vs Point-Snapping {#snap-dimensions}
 -----------------------------------------
 
+	Issue: This feature is planned to be removed in the next publication
+	in order to reduce the feature-set of Level 1.
+	It is included here for future reference in defining Level 2.
+
 	There are two distinct <dfn lt="snap behavior|snapping behavior">snapping behaviors</dfn> that a <a>scroll container</a> might engage in:
 
 	: <dfn export local-lt="axis" lt="axis-snapping|axis-snap">axis-snapping</dfn>