Fix names spelling in the contributor list

Change-Id: I057f0ae070e4b66628dd2ff64aa716dc2000f594
Reviewed-by: Sergey Belyashov <Sergey.Belyashov@gmail.com>
Reviewed-by: Dmitry Savchenko <dmitry.a.sav@gmail.com>
Reviewed-by: Viktor Ostashevskyi <ostash@ostash.kiev.ua>
Reviewed-by: Andrey M. Tokarev <andrey.m.tokarev@gmail.com>
Reviewed-by: Eike Ziller <eike.ziller@digia.com>