quick-start - use kubeless namespace

[jorijinnall]

Is this a BUG REPORT or FEATURE REQUEST?: FEATURE REQUEST

What happened:
Doc quick-start coherence about using kubeless namespace

What you expected to happen:
Use kubeless namespace everywhere

How to reproduce it (as minimally and precisely as possible):
N/A

Anything else we need to know?:

Environment:

• Kubernetes version (use kubectl version):
  `kubectl version
  Client Version: version.Info{Major:"1", Minor:"11", GitVersion:"v1.11.0", GitCommit:"91e7b4fd31fcd3d5f436da26c980becec37ceefe", GitTreeState:"clean", BuildDate:"2018-06-27T22:29:27Z", GoVersion:"go1.10.3", Compiler:"gc", Platform:"darwin/amd64"}
  Server Version: version.Info{Major:"1", Minor:"10", GitVersion:"v1.10.0", GitCommit:"fc32d2f3698e36b93322a3465f63a14e9f0eaead", GitTreeState:"clean", BuildDate:"2018-03-26T16:44:10Z", GoVersion:"go1.9.3", Compiler:"gc", Platform:"linux/amd64"}``
• Kubeless version (use kubeless version): v1.0.2
• Cloud provider or physical cluster: my laptop (minikube)