Update deprecated "replication controllers" example in Namespaces documentation

[kfess]

Page

https://kubernetes.io/docs/concepts/overview/working-with-objects/namespaces/#not-all-objects-are-in-a-namespace

Issue

The "Not all objects are in a namespace" section uses "replication controllers" as an example. Replication Controllers have been deprecated for many years and should be replaced with modern resources like Deployments.

Current:

Most Kubernetes resources (e.g. pods, services, replication controllers, and others)

Suggested:

Most Kubernetes resources (e.g. Pods, Services, Deployments, and others)

Also recommend capitalizing resource names (Nodes, PersistentVolumes) for consistency.

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