docs: add some complete samples for node_labels and dynamic vars render by inventory group

[kelein]

What type of PR is this?
/kind documentation

What this PR does / why we need it:

1. Add example for node_labels var defination to label or taint nodes
2. Add example for dynamic render containerd_default_runtime var by inventory group
3. Add example for containerd_additional_runtimes of nvidia
4. Add example for dynamic render nvidia_gpu_nodes var by inventory group'

Which issue(s) this PR fixes:
NONE

Special notes for your reviewer:

• sample for node_labelsdefination
• sample for dynamic set containerd_default_runtime
• sample for dynamic set nvidia_gpu_nodes var

Does this PR introduce a user-facing change?:

NONE

[k8s-ci-robot]

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[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: kelein
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