docs: sysctl/kernel: document random
This documents the random directory, based on the behaviour seen in drivers/char/random.c. Signed-off-by: Stephen Kitt <steve@sk2.org> Link: https://lore.kernel.org/r/20200623112514.10650-1-steve@sk2.orgSigned-off-by: Jonathan Corbet <corbet@lwn.net>
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