[docs] [issue17987] test.support.captured_stderr, captured_stdin not documented

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

I think it will be better to describe all three functions together (as sys.stdin/stdout/stderr).

.. function:: captured_stdin()
              captured_stdout()
              captured_stderr()

... description ...

   Example use::

      ... example for captured_stdin() ...

      ... example for captured_stdout() ...

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<http://bugs.python.org/issue17987>
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