docs(MADR): policy on namespace (#10148)

Signed-off-by: Ilya Lobkov <ilya.lobkov@konghq.com>
Signed-off-by: Marcin Skalski <skalskimarcin33@gmail.com>
Signed-off-by: Ilya Lobkov <lobkovilya@yandex.ru>
Co-authored-by: Marcin Skalski <skalskimarcin33@gmail.com>
Co-authored-by: Charly Molter <charly.molter@konghq.com>