fix xarray-spatial link (#115)

Author: martinfleis

doc/source/zonal_stats.ipynb

@@ -6998,8 +6998,13 @@
     "\n",
     "### xarray-spatial\n",
     "\n",
-    "The [zonal statistics](https://xarray-spatial.org/user_guide/zonal.html) available in `xarray-spatial` does not depend on GDAL unlike any of the previous options but uses Datashader's aggregate instead."
+    "The [zonal statistics](https://xarray-spatial.readthedocs.io/en/stable/user_guide/zonal.html) available in `xarray-spatial` does not depend on GDAL unlike any of the previous options but uses Datashader's aggregate instead."
    ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": []
   }
  ],
  "metadata": {
@@ -7018,7 +7023,7 @@
    "name": "python",
    "nbconvert_exporter": "python",
    "pygments_lexer": "ipython3",
-   "version": "3.13.1"
+   "version": "3.13.2"
   }
  },
  "nbformat": 4,