Fix effective directive for javascript navigation checks (#722)

Author: antosart

index.bs

@@ -1323,7 +1323,7 @@ spec:SRI; urlPrefix: https://w3c.github.io/webappsec-subresource-integrity
             1.  <a for=set>For each</a> |directive| of |policy|:
 
                 1.  Let |directive-name| be the result of executing
-                    [[#effective-directive-for-inline-check]] on |type|.
+                    [[#effective-directive-for-inline-check]] on "`navigation`".
 
                 2.  If |directive|'s <a for="directive">inline check</a>
                     returns "`Allowed`" when executed upon null,