From: Rob Landley <redacted>
Date: Sun, 04 Aug 2013 21:34:11 -0500

Putting it in linux/Documentation means you'll frequently tell newbies
"read the FAQ, except it's not on the web, we stuck it in a
subdirectory of a sudirectory of the kernel source because that's the
obvious place to stick the FAQ for a mailing list".

People who want to do kernel development grab a copy of the kernel
sources, therefore it's appropriate to document operation aspects
of kernel development there.