docs: added upgrade guide for admin (#2816)

www/docs/src/utils/filterListItems.ts

@@ -0,0 +1,9 @@
+export default function filterListItems (items: any[], pathPattern: string | RegExp) {
+  if (!items.length) {
+    return items
+  }
+
+  let pattern = new RegExp(pathPattern)
+
+  return items.filter((item) => pattern.test(item.href))
+}