media: media colorspaces*.rst: rename AdobeRGB to opRGB

commit a58c37978cf02f6d35d05ee4e9288cb8455f1401 upstream.

Drop all Adobe references and use the official opRGB standard
instead.

Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Cc: stable@vger.kernel.org
Acked-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>