DOC: Fix typo in nth docstring (pandas-dev#45633)

* Update groupby.py

* Trigger CI

Author: johnzangwill

pandas/core/groupby/groupby.py

@@ -2675,7 +2675,7 @@ def nth(
             A single nth value for the row or a list of nth values or slices.
 
             .. versionchanged:: 1.4.0
-                Added slice and lists containiing slices.
+                Added slice and lists containing slices.
                 Added index notation.
 
         dropna : {'any', 'all', None}, default None