Issue 21575: Show list.sort() arguments in the tutorial.

Doc/tutorial/datastructures.rst

@@ -68,10 +68,11 @@ objects:
    Return the number of times *x* appears in the list.
 
 
-.. method:: list.sort()
+.. method:: list.sort(cmp=None, key=None, reverse=False)
    :noindex:
 
-   Sort the items of the list, in place.
+   Sort the items of the list in place (the arguments can be used for sort
+   customization, see :func:`sorted` for their explanation).
 
 
 .. method:: list.reverse()