Docs/admin-guide/mm/damon/start: fix wrong example commands

mainline inclusion
from mainline-5.16
commit 82e3fff5
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I4GVMK
CVE: NA

-------------------------------------------------
Patch series "Fix trivial nits in Documentation/admin-guide/mm".

This patchset fixes trivial nits in admin guide documents for DAMON and
pagemap.

This patch (of 4):

Some of the example commands in DAMON getting started guide are
outdated, missing sudo, or just wrong.  This fixes those.

Link: https://lkml.kernel.org/r/20211022090311.3856-2-sj@kernel.org


Signed-off-by: SeongJae Park <sj@kernel.org>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Peter Xu <peterx@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
(cherry picked from commit 82e3fff5)
Signed-off-by: Yue Zou <zouyue3@huawei.com>
Reviewed-by: Kefeng Wang <wangkefeng.wang@huawei.com>
Signed-off-by: Zheng Zengkai <zhengzengkai@huawei.com>