docs(vald-operator): refine operator guide wording

[Matts966]

Description

SSIA

Related Issue

Versions

• Vald Version: v1.7.17
• Go Version: v1.26.1
• Rust Version: v1.94.1
• Docker Version: v29.3.1
• Kubernetes Version: v1.35.3
• Helm Version: v4.1.3
• NGT Version: v2.7.2
• Faiss Version: v1.14.1

Checklist

• I have read the CONTRIBUTING document and completed our CLA agreement.
• I have checked open Pull Requests for the similar feature or fixes?

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[vdaas-ci]

[CHATOPS:HELP] ChatOps commands.

• 🙆‍♀️ /approve - approve
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[Matts966]

/format

[vdaas-ci]

[FORMAT] Updating license headers and formatting go codes triggered by Matts966.

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