[3.13] gh-106318: Add examples for str.join() (GH-140315) (#141905)

Co-authored-by: Adorilson Bezerra <adorilson@gmail.com>
Co-authored-by: Stan Ulbrych <89152624+StanFromIreland@users.noreply.github.com>
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@ -2092,7 +2092,16 @@ expression support in the :mod:`re` module).
Return a string which is the concatenation of the strings in *iterable*.
A :exc:`TypeError` will be raised if there are any non-string values in
*iterable*, including :class:`bytes` objects. The separator between
elements is the string providing this method.
elements is the string providing this method. For example:
.. doctest::
>>> ', '.join(['spam', 'spam', 'spam'])
'spam, spam, spam'
>>> '-'.join('Python')
'P-y-t-h-o-n'
See also :meth:`split`.
.. method:: str.ljust(width, fillchar=' ', /)
@ -2306,6 +2315,8 @@ expression support in the :mod:`re` module).
>>> " foo ".split(maxsplit=0)
['foo ']
See also :meth:`join`.
.. index::
single: universal newlines; str.splitlines method