[cssom-1][editorial] Remove reference to fixed issue

The removed issue was fixed by 8274539.

Author: cdoublev

cssom-1/Overview.bs

@@ -3427,9 +3427,6 @@ getComputedStyle-sticky-pos-percent.html
 getComputedStyle-width-scroll.tentative.html
 </wpt>
 
-Issue: Should getComputedStyle() provide a useful serialization?
-See <a href="https://github.com/w3c/csswg-drafts/issues/1033">#1033</a>
-
 Utility APIs {#utility-apis}
 ============================
 
@@ -3754,4 +3751,4 @@ initial version of the alternative style sheets API and canonicalization
 
   <!-- Mutation Events are obsolete -->
   stylesheet-dom-mutation-event-crash.html
-</wpt>
+</wpt>