[scroll-animations-1] Update Changes section

Author: fantasai

scroll-animations-1/Overview.bs

@@ -1272,6 +1272,8 @@ spec: cssom-view-1; type: dfn;
 	and ancestor timelines with the specified names from being referenced
 	within this subtree.
 
+	ISSUE(8915): There's some open discussion about these blocking effects.
+
 	Values have the following meanings:
 
 	<dl dfn-for="timeline-scope" dfn-type=value>
@@ -1301,5 +1303,8 @@ spec: cssom-view-1; type: dfn;
 	Working Draft include:
 
 	* Removed <css>scroll-timeline-attachment</css> and <css>view-timeline-attachment</css> in favor of 'timeline-scope'.
+		(<a href="https://github.com/w3c/csswg-drafts/issues/7759">Issue 7759</a>)
+	* Switched named timelines to use <<dashed-ident>> instead of <<custom-ident>> in order to avoid name clashes with standard CSS keywords.
+		(<a href="https://github.com/w3c/csswg-drafts/issues/8746">Issue 8746</a>)
 
 	See also <a href="https://www.w3.org/TR/2023/WD-scroll-animations-1-20230428/#changes">Earlier Changes</a>.