mm,page_owner: update Documentation regarding page_owner_stacks

Update page_owner documentation including the new page_owner_stacks
feature to show how it can be used.

Link: https://lkml.kernel.org/r/[email protected]
Signed-off-by: Oscar Salvador <[email protected]>
Reviewed-by: Vlastimil Babka <[email protected]>
Reviewed-by: Marco Elver <[email protected]>
Acked-by: Andrey Konovalov <[email protected]>
Cc: Alexander Potapenko <[email protected]>
Cc: Michal Hocko <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>

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