[Doc]: fix demo doc to use `demo` namespace when deploying Halkyon resources

[pdettori]

I ran the demo tutorial and found that in the code snippet:

kubectl create ns demo
kubectl apply -f fruit-client-sb/target/classes/META-INF/dekorate/halkyon.yml
kubectl apply -f fruit-backend-sb/target/classes/META-INF/dekorate/halkyon.yml

the Halkyon resources get created in the default namespace, but the rest of the demo assumes that they should be in demo. So it should be instead:

kubectl create ns demo
kubectl apply -f fruit-client-sb/target/classes/META-INF/dekorate/halkyon.yml -n demo
kubectl apply -f fruit-backend-sb/target/classes/META-INF/dekorate/halkyon.yml -n demo

[cmoulliard]

I fixed the doc. Can you review and close if the problem is fixed please ? @pdettori

[pdettori]

@cmoulliard, it looks good, thx.