[css-align-3] Add link

Author: fantasai

css-align-3/Overview.bs

@@ -1072,7 +1072,8 @@ Overflow and Scroll Positions</h3>
 	they instead change its <a>initial scroll position</a>
 	so that the initially-visible content
 	of the <a>scroll container</a>
-	satisfies the expected alignment of the <a>alignment subject</a> and <a>alignment container</a>.
+	satisfies the [[#alignment-values|expected alignment]]
+	of the <a>alignment subject</a> and <a>alignment container</a>.
 
 	Note: The presence of scrollbars can change the size of the [=scroll container’s=] content box,
 	and thus the size of the [=alignment container=]