Update Overview.bs (w3c#6852)

Author: brandonscript

css-cascade-5/Overview.bs

@@ -62,7 +62,7 @@ Introduction</h2>
 	When different declarations try to set a value for the same element/property combination,
 	the conflicts must somehow be resolved.
 
-	The opposite problem arises when no declarations try to set a the value for an element/property combination.
+	The opposite problem arises when no declarations try to set a value for an element/property combination.
 	In this case, a value is be found by way of <a>inheritance</a>
 	or by looking at the property's <a>initial value</a>.