[issue9442] Update sys.version doc

[Georg Brandl]

Georg Brandl <georg at python.org> added the comment:

Yes, this is even better than my fix for #5778.  Changed in r83358 to:

   A string containing the version number of the Python interpreter plus additional
   information on the build number and compiler used.  This string is displayed
   when the interactive interpreter is started.  Do not extract version information
   out of it, rather, use :data:`version_info` and the functions provided by the
   :mod:`platform` module.

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nosy: +georg.brandl
resolution:  -> fixed
status: open -> closed

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