[docs] [issue16205] update :class:`str` references to link to the str type section

[Ezio Melotti]

Ezio Melotti added the comment:

If :class:`str` and :func:`str` point respectively to stdtypes.rst and functions.rst once a class directive is added to stdtypes.rst, then we can do that.  We might than need to update a few links to use :class: instead of :func:, and possibly use :ref:`textseq` where appropriate.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue16205>
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