docs: link runtime prerequisites instead of restating versions

[rinceyuan]

Summary

The getting-started prerequisites say Node.js 20+, but the Node SDK declares:

"engines": { "node": "^20.19.0 || >=22.12.0" }

So 20.0-20.18 and all of 21.x are unsupported, and a reader who follows this page onto one of them hits EBADENGINE at install time. nodejs/README.md already states the real constraint, so the list on this page had simply drifted.

Rather than correcting the number and leaving a second copy to drift again, this points each language at the Prerequisites section of its own README - the same thing docs/setup/bundled-cli.md now does. That keeps one source of truth per SDK.

Verification

• All six targets exist and expose a ## Prerequisites heading, and the ../<lang>/README.md paths resolve from docs/.
• Current floors, for reference: Node ^20.19.0 || >=22.12.0, Python >=3.11, Go 1.24, Rust 1.94.0, Java 17 (JDK 25 recommended), .NET any .NET Standard 2.0-compatible implementation. The removed line also understated .NET, which targets netstandard2.0 in addition to net8.0/net10.0.
• Prose only, no code blocks touched, so docs-validate is unaffected.

[Copilot]

🟢 Approval recommended

All links resolve to prerequisite sections that state the relevant runtime requirements.

Pull request overview

Replaces duplicated runtime versions with links to each SDK’s authoritative prerequisites.

Changes:

• Links all six language SDK prerequisite sections.
• Prevents runtime requirements from drifting across documentation.

File summaries

File	Description
docs/getting-started.md	References SDK-specific runtime prerequisites.

Review details

• Files reviewed: 1/1 changed files
• Comments generated: 0
• Review effort level: Balanced

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[SteveSandersonMS]

Verified: nodejs/package.json requires ^20.19.0 || >=22.12.0, so the old "Node.js 20+" line in getting-started.md was inaccurate (20.0-20.18 and 21.x actually fail with EBADENGINE), and the .NET line was similarly off. Confirmed all six linked README.md#prerequisites anchors resolve, and this matches the existing pattern in docs/setup/bundled-cli.md. Small, correct, prose-only fix. Approving.