[NOP] Corrected some typos and suboptimal wording

Change-Id: Id2bebff398cd590e3f7659ea407726eccee1776c
Reviewed-on: http://saros-build.imp.fu-berlin.de/gerrit/1445
Tested-by: Jenkins CI
Reviewed-by: Damla Durmaz <ddurmaz88@gmail.com>
Reviewed-by: Stefan Rossbach <srossbach@arcor.de>
Reviewed-by: Franz Zieris <zieris@inf.fu-berlin.de>