bpo-36760: Clarify subprocess capture_output docs. (GH-13322)

bpo-36760: Clarify subprocess capture_output docs. (GH-13322) · python/cpython@e883091

Original file line number	Diff line number	Diff line change
@@ -55,7 +55,9 @@ compatibility with older versions, see the :ref:`call-function-trio` section.
`55`	`55`	`If capture_output is true, stdout and stderr will be captured.`
`56`	`56`	When used, the internal :class:`Popen` object is automatically created with
`57`	`57`	``stdout=PIPE`` and ``stderr=PIPE``. The stdout and stderr arguments may
`58`		`- not be supplied at the same time as capture_output.`
	`58`	`+ not be supplied at the same time as capture_output. If you wish to capture`
	`59`	+ and combine both streams into one, use ``stdout=PIPE`` and ``stderr=STDOUT``
	`60`	`+ instead of capture_output.`
`59`	`61`
`60`	`62`	The timeout argument is passed to :meth:`Popen.communicate`. If the timeout
`61`	`63`	`expires, the child process will be killed and waited for. The`