Docs/admin-guide/mm/damon/start: add access pattern snapshot example

DAMON user-space tool (damo) provides access pattern snapshot feature,
which is expected to be frequently used for real time access pattern
analysis.  The snapshot output is also showing what DAMON provides on its
own, including the 'age' information.

In contrast, the recorded access patterns, which is shown as an example
usage on the quick start section, shows what users can make from what
DAMON provided.  It includes information that generated outside of DAMON
and makes the 'age' concept bit unclear.  Hence snapshot output is easier
at understanding the raw realtime output of DAMON.  Add the snapshot usage
example on the quick start section.

Link: https://lkml.kernel.org/r/[email protected]
Signed-off-by: SeongJae Park <[email protected]>
Cc: Jonathan Corbet <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>

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