Documentation: Fix a typo on trace/osnoise-tracer

mainline inclusion
from mainline-v5.14-rc1
commit bd09c055
category: feature
bugzilla: https://gitee.com/openeuler/kernel/issues/I4G64B
CVE: NA

-------------------------------------------------

s/RUNTIME IN USE/RUNTIME IN US/

Link: https://lkml.kernel.org/r/43e5160422a967218aa651c47f523e8d32d6a59e.1624872608.git.bristot@redhat.com



Fixes: bce29ac9 ("trace: Add osnoise tracer")
Signed-off-by: Daniel Bristot de Oliveira <bristot@redhat.com>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Signed-off-by: Wang ShaoBo <bobo.shaobowang@huawei.com>
Acked-by: Xie XiuQi <xiexiuqi@huawei.com>
Signed-off-by: Zheng Zengkai <zhengzengkai@huawei.com>