http-adapter: Document 403 for disabled Protocol Adapter
http-adapter: Document 403 for disabled Protocol Adapter

Add disabled protocol adapter to list of potential reasons for a 403 status code.

Signed-off-by: Sebastian Poehn <7b8d3696a9dd47ee3daf66a5e039df0a275cda03@bosch-si.com>

dejanb/hono,dejanb/hono,dejanb/hono