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

[Fred L. Drake, Jr.]

Fred L. Drake, Jr. added the comment:

>From v5 of the patch:
+   A context managers that temporarily replaces the :data:`sys.stdin` /
+   :data:`sys.stdout` / :data:`sys.stderr` stream with :class:`io.StringIO`
+   object.

I'd go with singular nouns instead of trying to map across them with plurals:

  Context manager that temporarily replaces the named stream with an
  :class:`io.StringIO` object.

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