[issue4137] update SIG web pages

[Paul Melis]

Paul Melis <paul at floorball-flamingos.nl> added the comment:

The "archive" and "subscribe" links for the C++ SIG is incorrect, as the
URL seems to have changed from

  http://mail.python.org/pipermail/c++-sig

to
  
  http://mail.python.org/pipermail/cplusplus-sig

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nosy: +paulmelis

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue4137>
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