sched/fair: Fix 'make xmldocs' warning caused by missing description

This patch fix following warning caused by missing description
"overload" in kernel/sched/fair.c

Warning(.//kernel/sched/fair.c:5906): No description found for
parameter 'overload'
Signed-off-by: NMasanari Iida <standby24x7@gmail.com>
Signed-off-by: NPeter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/1406518686-7274-1-git-send-email-standby24x7@gmail.comSigned-off-by: NIngo Molnar <mingo@kernel.org>

kernel/sched/fair.c

@@ -5898,6 +5898,7 @@ static inline int sg_capacity_factor(struct lb_env *env, struct sched_group *gro
  * @load_idx: Load index of sched_domain of this_cpu for load calc.
  * @local_group: Does group contain this_cpu.
  * @sgs: variable to hold the statistics for this group.
+ * @overload: Indicate more than one runnable task for any CPU.
  */
 static inline void update_sg_lb_stats(struct lb_env *env,
 			struct sched_group *group, int load_idx,