docs: move botching-up-ioctls.rst to the process guide

This is overall information for kernel developers, and not part of the
user-space API.

Cc: Daniel Vetter <[e-mail]>
Signed-off-by: Jonathan Corbet <[e-mail]>

Documentation/ioctl/index.rst

···
 
    ioctl-number
 
-   botching-up-ioctls
    ioctl-decoding
 
    cdrom

Documentation/process/index.rst

···
    adding-syscalls
    magic-number
    volatile-considered-harmful
+   botching-up-ioctls
    clang-format
 
 .. only::  subproject and html