fix small typo

week5/tutorial1.ipynb

@@ -1393,6 +1393,13 @@
     "buildings.building.value_counts()"
    ]
   },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "As you have seen from the `value_counts` function, there are quite a few buildings with only very few tags. You could either consider to not include them in your plot at all (for example by using the `isin` function or the `query` function, see also [here](https://stackoverflow.com/questions/12096252/use-a-list-of-values-to-select-rows-from-a-pandas-dataframe)), or rename them, similar to how you named the natural land cover classes for the land-use map. "
+   ]
+  },
   {
    "cell_type": "markdown",
    "metadata": {