[css-pseudo-4] Also remove mention of outline from painting section. w3c#3604

Author: fantasai

css-pseudo-4/Overview.bs

@@ -625,7 +625,7 @@ Painting the Highlight</h3>
   painting it
   immediately below any positioned descendants
   (i.e. just before step 8 in <a href="https://www.w3.org/TR/CSS21/zindex.html">CSS2.1&sect;E.2</a>).
-  Its outline, if any, is painted immediately over its background.
+  <!-- Its outline, if any, is painted immediately over its background. -->
   The ''::selection'' overlay is drawn
   over the ''::spelling-error'' overlay
   which is drawn over the ''::grammar-error'' overlay.
@@ -637,7 +637,7 @@ Painting the Highlight</h3>
   redraws that text
   (and its decorations)
   over the <a>highlight overlay</a> backgrounds
-  (and outlines, if any)
+  <!-- (and outlines, if any) -->
   using its own 'color',
   with ''currentColor'' on its 'color' property representing the 'color'
   of the next <a>highlight pseudo-element</a> layer below,