[css-scroll-snap-1] s/viewport/scrollport/ (now that we have this more precisely-defined term)

Author: fantasai

css-scroll-snap-1/Overview.bs

@@ -464,7 +464,7 @@ Scroll Snapport: the 'scroll-padding' property {#scroll-padding}
             </div>
     </dl>
 
-    These offsets reduce the region of the viewport
+    These offsets reduce the region of the <a>scrollport</a>
     that is considered “viewable” <em>for scrolling operations</em>:
     they have no effect on layout,
     on the scroll origin or initial position,
@@ -624,7 +624,7 @@ Scroll Snapping Alignment: the 'scroll-snap-align' property {#scroll-snap-align}
 <h4 id="snap-scope">
 Scoping Valid Snap Positions to Visible Boxes</h4>
 
-    Since the purpose of scroll snapping is to align content within the viewport
+    Since the purpose of scroll snapping is to align content within the <a>scrollport</a>
     for optimal viewing,
     a scroll position cannot be considered a valid <a>snap position</a>
     if <a>snapping</a> to it would leave the contributing <a>snap area</a>