clarify comments

js/test/Helper.js

@@ -229,7 +229,7 @@ describe('Helper', function () {
             cleanup();
         });
 
-/* TODO test fails in jsDOM version 17 - document.cookie remains empty
+/* TODO test fails since jsDOM version 17 - document.cookie remains empty
         jsc.property(
             'returns the requested cookie',
             jsc.nearray(jsc.nearray(common.jscAlnumString())),

js/test/TopNav.js

@@ -727,7 +727,7 @@ describe('TopNav', function () {
             cleanup();
         });
 
-        // TODO triggers error messages in jsDOM version 12, but passes
+        // TODO triggers error messages in jsDOM since version 12, but passes
         it(
             'displays raw text view correctly',
             function () {