Clarify limitations of 'Open' for PsychPortAudio #14
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The wording of the documentation for PsychPortAudio('Open') gives the impression that only one stream per device can ever be opened, but calling `run` from [the Python demo for PPA](https://github.com/Psychtoolbox-3/Psychtoolbox-3/blob/master/PsychPython/demos/ppatest_pythonic.py), which opens and closes a new stream each time, works fine when called multiple times in a single session. The proposed wording clarifies that the limitation is one stream *at a time* rather than one stream *total*.
The link to docs for 'OpenSlave' was also broken, so I added the prefix `PsychPortAudio-` while in the neighbourhood.
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The wording of the documentation for PsychPortAudio('Open') gives the impression that only one stream per device can ever be opened, but calling
runfrom the Python demo for PPA, which opens and closes a new stream each time, works fine when called multiple times in a single session. The proposed wording clarifies that the limitation is one stream at a time rather than one stream total.The link to docs for 'OpenSlave' was also broken, so I added the prefix
PsychPortAudio-while in the neighbourhood.