fix k8s fass-netes deploy docs, namespace.yml is at the root of the repo.
fix k8s fass-netes deploy docs, namespace.yml is at the root of the repo.

Signed-off-by: Philippe Granger <09e01e92a487ae5acc7224346d213c27743e8631@elementai.com>

openfaas/faas,rgee0/faas,alexellis/faas,alexellis/faas,rgee0/faas,alexellis/faas,openfaas/faas,rgee0/faas,rgee0/faas,alexellis/faas,rgee0/faas,alexellis/faas,rgee0/faas,rgee0/faas,alexellis/faas,alexellis/faas,openfaas/faas,rgee0/faas,rgee0/faas,rgee0/faas,alexellis/faas,alexellis/faas