[css-align-3] Update changes list

Author: fantasai

css-align-3/Overview.bs

@@ -2433,6 +2433,18 @@ Appendix A: Static Position Terminology</h2>
 <h2 id="changes">
 Changes</h2>
 
+	Changes since the <a href="https://www.w3.org/TR/2021/WD-css-align-3-20211224/">24 December 2021 Working Draft</a> include:
+	<ul>
+		<li>Remove definition of special behavior for including padding in [=scrollable overflow=]
+			for non-''align-content/normal'' alignments
+			since this is now defined unconditionally in [[!CSS-OVERFLOW-3]].
+			(<a href="https://github.com/w3c/csswg-drafts/issues/129#issuecomment-1113489051">Issue 129</a>)
+		<li>Minor clarifications:
+			* Define [=fallback alignment=] of a [=baseline-sharing group=]
+				as the shared [=fallback alignment=] of its individual items.
+			* Annotate <<length-percentage>> value definitions using [=bracketed range notation=].
+	</ul>
+
 	Changes since the <a href="https://www.w3.org/TR/2020/WD-css-align-3-20200421/">21 April 2020 Working Draft</a> include:
 	<ul>
 		<li>Allowed reordering of ''[ first | last ]'' and ''align-self/baseline'' components of <<baseline-position>>.