docs: kdoc: remove the INLINE_END state
It is never used, so just get rid of it.
Reviewed-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Link: https://lore.kernel.org/r/20250627184000.132291-7-corbet@lwn.net