EDAC: Update documentation for the CXL memory patrol scrub control feature

Update the Documentation/edac/scrub.rst to include use cases and
policies for CXL memory device-based, CXL region-based patrol scrub
control and CXL Error Check Scrub (ECS).

Reviewed-by: Dave Jiang <[email protected]>
Reviewed-by: Jonathan Cameron <[email protected]>
Signed-off-by: Shiju Jose <[email protected]>
Reviewed-by: Fan Ni <[email protected]>
Reviewed-by: Alison Schofield <[email protected]>
Acked-by: Dan Williams <[email protected]>
Link: https://patch.msgid.link/[email protected]
Signed-off-by: Dave Jiang <[email protected]>

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