fix: getComposedParent should not return slot nodes (#438)

* fix: getComposedParent should not return slot nodes

* chore: Fix comment mistake

Author: WilcoFiers

lib/commons/dom/get-composed-parent.js

@@ -9,7 +9,7 @@ dom.getComposedParent = function getComposedParent (element)  {
     // NOTE: If the display of a slot element isn't 'contents',
     // the slot shouldn't be ignored. Chrome does not support this (yet) so,
     // we'll skip this part for now.
-    return getComposedParent(element.assignedSlot); // content of a shadow DOM slot
+    return getComposedParent(element.assignedSlot); // parent of a shadow DOM slot
   } else if (element.parentNode) {
     var parentNode = element.parentNode;
     if (parentNode.nodeType === 1) {