[css-cascade-5] Remove closed issues

Author: mirisuzanne

css-cascade-5/Overview.bs

@@ -882,10 +882,6 @@ Cascade Sorting Order</h3>
 			Note: This follows the same logic used for layering [=normal=] and [=important=] [=origins=],
 			so that the ''!important'' flag maintains the same “override” purpose in both settings.
 
-			Issue(w3c/csswg-drafts#5003): Where do Layers fit in the cascade?
-
-			Issue(w3c/csswg-drafts#4971): How do Layers interact with ''!important''?
-
 		<dt id='cascade-specificity'>Specificity
 		<dd>
 			The <a href="https://www.w3.org/TR/selectors/#specificity">Selectors module</a> [[!SELECT]] describes how to compute the specificity of a selector.