sched: Fix (harmless) typo 'CONFG_FAIR_GROUP_SCHED'

This patch fixes a typo located in a comment.

Signed-off-by: Jan Schoenherr <schnhrr@cs.tu-berlin.de>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/1310580816-10861-2-git-send-email-schnhrr@cs.tu-berlin.de


Signed-off-by: Ingo Molnar <mingo@elte.hu>