revert image link

Author: TomNicholas

intermediate/datastructures-intermediate.ipynb

@@ -30,7 +30,7 @@
     "\n",
     "Variables hold arbitrary metadata, dimension names, and an Array of data\n",
     "\n",
-    "![image.png](../_static/variable-model.png)\n",
+    "![image.png](../_static/variable.png)\n",
     "\n",
     "## DataArray\n",
     "\n",