add numpy advanced indexing

Author: negin513

intermediate/indexing/advanced-indexing.ipynb

@@ -379,10 +379,15 @@
     "\n",
     ":::{seealso}\n",
     "- [NumPy Fancy Indexing](https://numpy.org/doc/stable/reference/arrays.indexing.html#fancy-indexing)\n",
-    "- [Xarray Indexing](indexing.md)\n",
+    "- [NumPy Advanced Indexing](https://numpy.org/doc/stable/user/basics.indexing.html#advanced-indexing)\n",
     "\n",
     ":::\n"
    ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": []
   }
  ],
  "metadata": {