add missing field kubernetes.volume.fs.inodes.pct to sample_event.json

[gsantoro]

What does this PR do?

Add missing fields kubernetes.volume.fs.inodes.pct to sample_event.json and regenerated docs

Checklist

• I have reviewed tips for building integrations and this pull request is aligned with them.
• I have verified that all data streams collect metrics or logs.-
• I have added an entry to my package's changelog.yml file.-
• I have verified that Kibana version constraints are current according to guidelines.-

Author's Checklist

• docs integrations/packages/kubernetes/docs/kubelet.md contain the field kubernetes.volume.fs.inodes.pct in the sample doc

[elasticmachine]

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• Start Time: 2022-04-12T09:38:42.136+0000

• Duration: 44 min 58 sec

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Test	Results
Failed	0
Passed	116
Skipped	0
Total	116

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[MichaelKatsoulis]

LGTM