docs(ja): fix "Attributes" spelling in the Kubernetes guide

[Rohan5commit]

• I have read and followed the Contributing docs, especially the "First-time contributing?" section.
• This PR has content that I did not fully write myself.
  • I used AI and I have read and followed the Generative AI Contribution Policy.
• I have the experience and knowledge necessary to understand, review, and validate all content in this PR.

Summary

• Fix the English word in the Japanese Kubernetes guide heading from "Atributes" to "Attributes"

Related issue

• N/A (trivial docs-only typo fix)

Guideline alignment

• Followed the repo CONTRIBUTING guide and PR template guidance
• Keeps the change docs-only, single-file, and sentence-scoped

Validation/testing

• Not run; docs-only wording change

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Pull request overview

This PR corrects a typo in the Japanese Kubernetes getting-started guide by fixing the English word in a section heading from “Atributes” to “Attributes”.

Changes:

• Fix spelling in the heading “Kubernetes Attributes Processor”.

[theletterf]

@Rohan5commit Could you sign the CLA?