[css-values-5] Remove closed issue #11424 #13578

Author: tabatkins

css-values-5/Overview.bs

@@ -2196,8 +2196,6 @@ Constructing <<custom-ident>> values: the ''ident()'' function</h3>
 	<dfn><<ident-arg>></dfn> = <<string>> | <<integer>> | <<ident>>
 	</pre>
 
-	Issue(w3c/csswg-drafts#11424): Should we allow a fallback value?
-
 	The ''ident()'' function can be used as a value for any property or function argument
 	that accepts a <<custom-ident>>.