Corrected the relation of POSIX and IEEE

Until now, we were saying "POSIX is defined by the IEEE", but in issue #12,
Michael Crusoe pointed out that this is not accurate. It is actually
jointly developed and operated by the IEEE, The Open Group and ISO/IEC JTC
1/SC 22, which together form the Austin Group.

So the sentence was modified to say tha the IEEE (potential publisher of
this paper) is part of the Austin Group that develops the POSIX standard.

Thanks a lot for bringing this up Michael.

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