[css-scroll-snap] Comment out group snapping.

Author: tabatkins

css-scroll-snap/Overview.bs

@@ -658,7 +658,7 @@ Choosing Snap Points {#choosing}
 		which automatically add additional snap points to themselves
 		so a user can pan to see the entire element.)
 
-
+<!--
 Group-based Snapping {#group}
 ========================
 
@@ -732,8 +732,8 @@ Aligning the Group: the 'scroll-snap-group' property {#scroll-snap-group}
 -----------------
 
 	<pre class="propdef">
-	Name: scroll-snap-group
-	Value: [ start-edge | end-edge | edges | center ]{1,2}
+	Name: scroll-snap-group-align
+	Value: <'scroll-snap-align'>
 	Initial: start
 	Applies to: all elements
 	Inherited: no
@@ -743,3 +743,4 @@ Aligning the Group: the 'scroll-snap-group' property {#scroll-snap-group}
 	</pre>
 
 	Specifies the alignment of a group-snapped group's area within the viewport.
+-->