Docs/admin-guide/mm/damon/start: update snapshot example

Docs/admin-guide/mm/damon/start: update snapshot example

Two of DAMON user-space tool (damo) commands that are used for examples on
DAMON getting started document, namely 'damo show' and 'damo report heats'
are deprecated[1,2], and replaced by new commands that provides same
functions with unified and simplified user interfaces.  Also the example
output of 'damo show' is outdated.  'damo schemes' command is not
deprecated, but users are recommended to use 'damo start' or 'damo tune'
instead.

Update the examples to use the replacements, recommendations, and
up-to-date output formats.

[1] https://git.kernel.org/sj/damo/c/3272e0ac94ecc5e1
[2] https://git.kernel.org/sj/damo/c/da3ec66bbdd9e87d

Link: https://lkml.kernel.org/r/20250110185232.54907-5-sj@kernel.org
Signed-off-by: SeongJae Park <sj@kernel.org>
Cc: Honggyu Kim <honggyu.kim@sk.com>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Yunjeong Mun <yunjeong.mun@sk.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>