[css-snappoints] Editorial updates to scroll-snap-area

Author: ChumpChief

css-snappoints/Overview.bs

@@ -256,7 +256,7 @@ Ignored Terms: scroll-snap-positions-*, containing block chain
 
 <h2 id="scroll-snap-area">Scroll Snap Area: the 'scroll-snap-area' property</h2>
 
-    The 'scroll-snap-area' property defines a region for an element used in calculating <a>snap positions</a> for its ancestor scroll container.
+    The 'scroll-snap-area' property defines the <a>scroll-snap-area</a> on elements within a <a>scroll container</a>, used in calculating <a>snap positions</a> for that scroll container.
 
     <pre class="propdef">
     Name: scroll-snap-area
@@ -275,9 +275,11 @@ Ignored Terms: scroll-snap-positions-*, containing block chain
         <dd>
             Specifies the outset of the element's snap area from the axis-aligned bounding box of the transformed specified box, in the <a>scroll container's</a> coordinate space.  Outsets are applied to this bounding box, not the specified box.  If the box argument is omitted it defaults to border-box.
 
-            Note: This ensures that the scroll snap area is always rectangular and axis-aligned to the <a>scroll container's</a> coordinate space.
+            Note: This ensures that the <a>scroll snap area</a> is always rectangular and axis-aligned to the <a>scroll container's</a> coordinate space.
     </dl>
 
+    This property is a shorthand property that sets all of the 'scroll-snap-area-*' longhands in one declaration.
+
 <h2 id="scroll-snap-align">Scroll Snap Align: the 'scroll-snap-align' property</h2>
 
     The 'scroll-snap-align' property specifies how a scroll container's region specified by 'scroll-snap-padding' should align with descendent elements' scroll snap area.  The two values specify the snapping behavior in the x and y axes, respectively.  If only one value is specified, the second value defaults to the same value.