[css-snappoints] Some wording updates

Author: ChumpChief

css-snappoints/Overview.bs

@@ -188,17 +188,15 @@ Overview {#overview}
     as a particular alignment ('scroll-snap-align')
     of an element's <a>scroll snap margin</a> ('scroll-snap-margin', defaulting to its border box)
     within the <a>scroll container</a>’s <a>snap alignment container</a>
-    (the rectangle obtained by reducing its visual viewport by its 'scroll-snap-padding').
+    (its visual viewport, as reduced by its 'scroll-snap-padding').
     This is conceptually equivalent to specifying the alignment of
     an <a>alignment subject</a> within an <a>alignment container</a>.
     A scroll position that satisfies the specified alignment
     is a <a>snap position</a>.
 
     The CSS Scroll Snap Module intentionally does not specify nor mandate any precise animations or physics used in <a>snapping</a>; this is left up to the user agent.
 
-    <a>Snap positions</a> must only affect the nearest ancestor
-    (on the element's <a>containing block chain</a>)
-    <a>scroll container</a>.
+    <a>Snap positions</a> only affect the nearest ancestor <a>scroll container</a> on the element's <a>containing block chain</a>.
 
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@@ -327,13 +325,7 @@ Scroll Snap Padding: the 'scroll-snap-padding' property {#scroll-snap-padding}
     Animatable: as length, percentage, or calc
     </pre>
 
-    The 'scroll-snap-padding' property defines the <a>snap alignment container</a>, a region inset from the visual viewport of a <a>scroll container</a> used in calculating its <a>snap positions</a>.  The snap alignment container is used as the alignment container when calculating <a>snap positions</a>.
-
-    <dl dfn-type="value" dfn-for="scroll-snap-padding">
-        <dt><dfn>[ <<length>> | <<percentage>> ]{1,4}</dfn>
-        <dd>
-            Specifies the region inset from the visual viewport.  Values are interpreted as for 'padding', and specify inward offsets from each edge of the visual viewport.
-    </dl>
+    The 'scroll-snap-padding' property defines the <a>snap alignment container</a>, a region inset from the visual viewport of a <a>scroll container</a> used in calculating its <a>snap positions</a>.  The snap alignment container is used as the alignment container when calculating <a>snap positions</a>.  Values are interpreted as for 'padding', and specify inward offsets from each edge of the visual viewport.
 
     <div class="example">
         In this example, scroll-snap-padding is used to center slideshow images within the portion of the viewport that is not obscured by a fixed-position toolbar.