fix dropdown note formatting

Author: scottyhq

intermediate/indexing/advanced-indexing.ipynb

@@ -112,8 +112,8 @@
     "\n",
     ":::\n",
     "\n",
-    ":::{note} Orthogonal indexing with NumPy\n",
-    ":class: dropdown\n",
+    ":::{admonition} Orthogonal indexing with NumPy\n",
+    ":class: note dropdown\n",
     "\n",
     "While pointwise indexing is the default behavior in NumPy, you can achieve orthogonal indexing by using the [`np.ix_` function](https://numpy.org/doc/stable/reference/generated/numpy.ix_.html). This function constructs an open mesh from multiple arrays, allowing you to index along each dimension independently similar to Xarray indexing behavior. For example: \n",
     "\n",