Documentation: document ioctl interfaces better

Documentation/process/botching-up-ioctls.rst was orignally written as
a blog post for DRM driver writers, so it it misses some points while
going into a lot of detail on others.

Try to provide a replacement that addresses typical issues across a wider
range of subsystems, and follows the style of the core-api documentation
better.

Many improvements to the document are suggested by Ben Hutchings
<[email protected]>, Jonathan Corbet <[email protected]> and
Geert Uytterhoeven <[email protected]>.

Reviewed-by: Ben Hutchings <[email protected]>
Signed-off-by: Arnd Bergmann <[email protected]>

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