media: zoran.rst: place it at the right place this time

I was too quick moving zoran.rst... it ends that the original
patch didn't do the right thing and forgot to update the files
that references it.

Fix it.

Fixes: 6b903469

 ("media: zoran: move documentation file to the right place")
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>