[1.12] Update docs for Kubernetes nameresolver

[ItalyPaleAle]

Docs for the Kubernetes nameresolver needs to be updated to add templating. See: dapr/components-contrib#2883

[hhunter-ms]

@ItalyPaleAle friendly bump

[hhunter-ms]

@MaxSchaefer could you add this to the docs for 1.12?

[mukundansundar]

@ItalyPaleAle Is this a correct configuration that can be set for k8s name resolver if cluster domain or template (mutually exclusive) parameters are to be set:

apiVersion: dapr.io/v1alpha1
kind: Configuration
metadata:
  name: appconfig
spec:
  nameResolution:
    component: "kubernetes"
    configuration:
      "clusterDomain": "testDomain"
      "template": "{{.ID}}-{{.Data.region}}.internal:{{.Port}}"