fix typo

Author: sarah-hlsn

doc/user-guide/climada_engine_Impact.ipynb

@@ -863,7 +863,7 @@
     "```\n",
     "The `threshold` argument defines the maximum distance of the nearest neighbor in the units of the `Exposure` crs.  Setting `threshold` to 0 disables nearest neighbor matching and enforces exact matching. By default twice the highest resolution of the hazard centroids is chosen.\n",
     "\n",
-    "When assingning `Centroids` manually, make sure to pass `assign_centroids=False` to the impact calculation, so that the assignment is not lost:\n",
+    "When assigning `Centroids` manually, make sure to pass `assign_centroids=False` to the impact calculation, so that the assignment is not lost:\n",
     "```\n",
     "imp = ImpactCalc(exp_lp, impf_set, tc).impact(\n",
     "    save_mat=False,\n",