Fix writing style and tone inconsistencies

[mintlify]

Summary

Audited all MDX documentation pages for writing style and tone consistency. Fixed the following issues across 9 files:

• Typos: "providers" → "provides" (ai-edge/overview), "can be manage" → "can be managed" (dns)
• Heading capitalization: Standardized to title case across dns.mdx, datumctl/overview.mdx, datumctl/authentication.mdx, datumctl/activity.mdx, and domains.mdx
• Voice consistency: Replaced third-person "users" with second-person "you" in datumctl/activity.mdx and metrics-export.mdx
• Formatting: Fixed missing spaces after inline code spans, broken bold markdown syntax, removed extra whitespace
• Grammar: "quickly setup" → "quickly set up" (verb form) in metrics-export.mdx
• Cleanup: Removed broken empty heading link in kubernetes.mdx, fixed inconsistent dash style in dns.mdx

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[cla-assistant]

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_{You have signed the CLA already but the status is still pending? Let us recheck it.}

[mintlify]

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