[css-cascade-4] Filled in rest of Changes list, based on reviewing the diff from last TR publication.

Author: tabatkins

css-cascade-4/Overview.bs

@@ -1027,7 +1027,14 @@ Changes</h2>
 	<ul>
 		<li>Clarified that ''revert'' only affects the cascaded value, not the inherited value.
 		<li>Clarified that <a>custom properties</a> are not reset by the 'all' shorthand.
-		(<a href="https://github.com/w3c/csswg-drafts/issues/2518">2518</a>)
+			(<a href="https://github.com/w3c/csswg-drafts/issues/2518">2518</a>)
+		<li>Clarified that text nodes are children of their parent element,
+			and receive styles via defaulting.
+		<li>Defined more precisely that imported stylesheets are interpreted separately from the importing stylesheet,
+			in terms of ordering of rules, etc.
+		<li>Precisely defined the types of aliasing that CSS uses. ([[#aliasing]])
+		<li>Removed any mention of the “override” origin,
+			originally defined by <a href="https://www.w3.org/TR/2000/REC-DOM-Level-2-Style-20001113/">DOM Level 2 Style</a>.
 	</ul>
 
 	Changes since the <a href="https://www.w3.org/TR/2015/WD-css-cascade-4-20150421/">21 April 2015 Working Draft</a> include: