fix internal link, add cell tags

Author: scottyhq

fundamentals/03.1_computation_with_xarray.ipynb

@@ -4,6 +4,7 @@
    "cell_type": "markdown",
    "metadata": {},
    "source": [
+    "(fundamentals/basic-computation)=\n",
     "# Basic Computation\n",
     "\n",
     "In this lesson, we discuss how to do scientific computations with xarray\n",

intermediate/hierarchical_computation.ipynb

@@ -7,7 +7,7 @@
    "source": [
     "# Hierarchical computations\n",
     "\n",
-    "In this lesson, we extend what we learned about [basic computation](#basic-computation) to hierarchical datasets. By the end of the lesson, we will be able to:\n",
+    "In this lesson, we extend what we learned about <project:#fundamentals/basic-computation> to hierarchical datasets. By the end of the lesson, we will be able to:\n",
     "\n",
     "- Apply basic arithmetic and label-aware reductions to xarray DataTree objects\n",
     "- Apply arbitrary functions across all nodes across a tree"
@@ -201,7 +201,12 @@
    "cell_type": "code",
    "execution_count": null,
    "id": "18",
-   "metadata": {},
+   "metadata": {
+    "tags": [
+     "raises-exception",
+     "hide-output"
+    ]
+   },
    "outputs": [],
    "source": [
     "tree.map_over_datasets(demean)"