fix(k8s): remove doc temprary (#3912)

Author: bene2k1

containers/kubernetes/api-cli/managing-storage.mdx

@@ -1674,10 +1674,6 @@
                     "label": "Monitoring clusters",
                     "slug": "cluster-monitoring"
                   },
-                  {
-                    "label": "Managing storage",
-                    "slug": "managing-storage"
-                  },
                   {
                     "label": "Managing tags",
                     "slug": "managing-tags"