Issue #16265: Fix collapsing of code sample in tutorial.

Thanks to Yongzhi Pan from docs@

Doc/tutorial/inputoutput.rst

@@ -184,7 +184,7 @@ square brackets ``'[]'`` to access the keys ::
 
    >>> table = {'Sjoerd': 4127, 'Jack': 4098, 'Dcab': 8637678}
    >>> print('Jack: {0[Jack]:d}; Sjoerd: {0[Sjoerd]:d}; '
-             'Dcab: {0[Dcab]:d}'.format(table))
+   ...       'Dcab: {0[Dcab]:d}'.format(table))
    Jack: 4098; Sjoerd: 4127; Dcab: 8637678
 
 This could also be done by passing the table as keyword arguments with the '**'