doc-rst: kernel-doc: fix a change introduced by mistake

changeset b7e67f6c

 ("doc-rst: linux_tv: supress lots of warnings")
were meant to touch only on media files, but it also touched
at this script by mistake. Revert such change.

Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>