Each Node has an associated Lease object in the kube-node-lease namespace. Lease is a lightweight resource, which improves the performance of the node heartbeats as the cluster scales.
Removed ambiguous word 'temporarily', as namespace set using that method, is not temporary. It is permanent for a current resource and there is no concept of a temporary namespace in K8s.
Also, for consisteny '--namespace' flag added after the actual command.
* Adding what's new section to namespace concepts
To learn more about namespaces and give better navigation this section is added.
* Update namespaces.md
k8s does not support nested namespaces but this is not specified anywhere in the document. I find this is the right place to document it as we introduce namespace concept here. Also these details are important to mention specifically for users who are coming from Docker UCP background.