[css-snappoints] Clarifying dimension of snap padding

Author: ChumpChief

css-snappoints/Overview.bs

@@ -321,7 +321,7 @@ Scroll Snap Padding: the 'scroll-snap-padding' property {#scroll-snap-padding}
     Initial: 0
     Applies to: <a>scroll containers</a>
     Inherited: no
-    Percentages: relative to the scroll container's visual viewport
+    Percentages: relative to the corresponding dimension of the scroll container's visual viewport
     Media: interactive
     Computed value: as specified, with lengths made absolute
     Animatable: yes