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This commit removes references to sections erased by Commit 91553039


("Documentation: Kill all references to mmiowb()").
Signed-off-by: SeongJae Park <sj38.park@gmail.com>
Link: https://lore.kernel.org/r/20191121234125.28032-6-sj38.park@gmail.com

Signed-off-by: Jonathan Corbet <corbet@lwn.net>