[css-shadow-1][editorial] Added note about merge of CSS Scoping 1 and CSS Shadow Parts 1 and renaming to CSS Shadow 1

See w3c#5809 (comment).

Author: SebastianZ

css-cascade-6/Overview.bs

@@ -458,7 +458,7 @@ Syntax of ''@scope''</h4>
 <h4 id="scoped-rules">
 Scoped Style Rules</h4>
 
-	<dfn>Scoped style rules</dfn> differ from non-scoped rules
+	<dfn export>Scoped style rules</dfn> differ from non-scoped rules
 	in the following ways:
 
 	* Their selectors can only match elements that are [=in scope=].

css-shadow-1/Overview.bs

@@ -110,6 +110,10 @@ Furthermore, the ''::slotted'' [=pseudo-element=] and the related '':has-slotted
 	style-sharing.html
 </wpt>
 
+Note: This specification was originally titled CSS Scoping Module Level 1.
+It has since been merged with CSS Shadow Parts Module Level 1 and renamed to CSS Shadow Module Level 1
+to better reflect its comprehensive coverage of Shadow DOM features.
+The [=scoped style rules=] feature initially described in this module has been moved to [[css-cascade-6]].
 
 
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