chore(docs): improve openTelemetry installation command

[Icarus9913]

Refer to openTelemetry helm installation UPGRADING, the openTelemetry helm requires the parameter image.repository must be set.

Notice: There are 2 options for this parameter, and OpenTelemetry Collector Kubernetes Distro will be the default image used for the chart(And we also need to update our OpenTelemetry collector configuration). Currently, we use Contrib distribution for transitions.

OpenTelemetry Collector Kubernetes Distro

image:
  repository: "otel/opentelemetry-collector-k8s"

Contrib distribution

image:
  repository: "otel/opentelemetry-collector-contrib"

close #1796

Did you sign your commit? Instructions yes

Have you read Contributing guidelines? yes

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[Icarus9913]

cc @Automaat

[Icarus9913]

Run $(go env GOPATH)/bin/muffet \
https://deploy-preview-1797--kuma.netlify.app/docs/dev/quickstart/kubernetes-demo/
    timeout https://kind.sigs.k8s.io/
https://deploy-preview-1797--kuma.netlify.app/docs/2.7.x/quickstart/kubernetes-demo/
    timeout https://kind.sigs.k8s.io/
https://deploy-preview-1797--kuma.netlify.app/docs/dev/guides/migration-to-the-new-policies/
    timeout https://kind.sigs.k8s.io/
https://deploy-preview-1797--kuma.netlify.app/docs/2.7.x/guides/migration-to-the-new-policies/
    timeout https://kind.sigs.k8s.io/

Need re-run for that github action