correcting example in comparison with spreadsheets (#43377)

Author: Digres45

doc/source/getting_started/comparison/includes/nth_word.rst

@@ -5,5 +5,5 @@ word by index. Note there are more powerful approaches should you need them.
 
    firstlast = pd.DataFrame({"String": ["John Smith", "Jane Cook"]})
    firstlast["First_Name"] = firstlast["String"].str.split(" ", expand=True)[0]
-   firstlast["Last_Name"] = firstlast["String"].str.rsplit(" ", expand=True)[0]
+   firstlast["Last_Name"] = firstlast["String"].str.rsplit(" ", expand=True)[1]
    firstlast