[css-anchor-position-1][editorial] Add issue to fix example

Author: tabatkins

css-anchor-position-1/Overview.bs

@@ -355,6 +355,8 @@ from being referenced elsewhere in the page.
 	stacking up on top of each other.
 </div>
 
+Issue: Fix the above example, since the use-case is now automatic.
+
 <!-- Big Text: lookup
 
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