[css-align-3][editorial] Add Changes entry for Gaps properties being moved.

Author: kbabbitt

css-align-3/Overview.bs

@@ -2392,6 +2392,8 @@ Changes</h2>
 	* Defined that 'justify-self' affects the [=automatic size=] of block-level boxes
 		the same way it does for flex and grid items.
 		(<a href="https://github.com/w3c/csswg-drafts/issues/12102">Issue 12102</a>)
+	* Moved the gap properties to [[!CSS-GAPS-1]].
+		(<a href="https://github.com/w3c/csswg-drafts/issues/13089">Issue 13089</a>)
 
 	See also <a href="https://www.w3.org/TR/2025/WD-css-align-3-20250311/#changes">previous changes</a>.