docs: fix style guide violations in docs/reference subtree

[alexandra5000]

TESTING THE docs-quality-sweep WORKFLOW

Summary

Style guide fixes across the docs/reference subtree (excluding edot-sdks/ which has a separate PR, and architecture image alt text which is deferred):

• Remove temporal qualifiers: currently, not yet, would be → present tense
• Replace marketing language: seamlessly, engineered for, robust and scalable mechanism, great experience, continuously → factual alternatives
• Word order: also can → can also
• Typo: receiveing → receiving
• Missing commas: Oxford comma in one list; comma after introductory clause
• Active voice: will be used/validated → present active; users can → you can
• Menu path arrow: > → →
• List marker normalization: * → *
• Imperative phrasing: Spin up → Set up; Wait some time → Allow time
• Removed (ACKs) verb shorthand in favor of spelled-out acknowledges

Files changed: index.md, central-configuration.md, architecture/k8s.md, compatibility/nomenclature.md, compatibility/limitations.md, motlp/index.md, motlp/troubleshooting.md, edot-cloud-forwarder/gcp/index.md

Test plan

• Docs build passes
• No meaning changes — purely style/grammar fixes

🤖 Generated with Claude Code

[github-actions]

🔍 Preview links for changed docs

• docs/reference/architecture/k8s.md
• docs/reference/central-configuration.md
• docs/reference/compatibility/limitations.md
• docs/reference/compatibility/nomenclature.md
• docs/reference/edot-cloud-forwarder/gcp/index.md
• docs/reference/index.md
• docs/reference/motlp/index.md
• docs/reference/motlp/troubleshooting.md

[github-actions]

Elastic Docs Style Checker (Vale)

Summary: 1 warning found

⚠️ Warnings (1): Fix when the suggestion improves clarity or correctness.

File	Line	Rule	Message
docs/reference/compatibility/limitations.md	85	Elastic.MenuArrows	Use '→' to separate menu items, not '' or '='. Example: Select Manage index → Add lifecycle policy.

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The Vale linter checks documentation changes against the Elastic Docs style guide. To use Vale locally or report issues, refer to Elastic style guide for Vale.