docs: installation: downloads: docker: document Windows Server 2025 and Nano Server images

[eschabell]

• Replace stale Windows Server 2019/2022 claim with a tag table covering windows-2022, windows-2025, and windows-nano-2025 (new in 5.1)
• Note Nano Server's PowerShell/exec-plugin limitations and its default Forward-to-stdout configuration
• Drop the Windows Server 2019 claim, deprecated upstream well before this release and no longer built

Summary by CodeRabbit

• Documentation
  • Updated Windows container documentation with tags for Server Core and Nano Server variants.
  • Added Windows Server 2025 and Nano Server availability details for Fluent Bit 5.1 and later.
  • Documented Nano Server limitations, default configuration, and an example image pull command.
• Style
  • Updated spelling rules to recognize “Nano” as a valid term.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: 05c2fc22-e44c-4034-a621-c3d21af0bbf1

📥 Commits

Reviewing files that changed from the base of the PR and between df5b6df and 1c27b4b.

📒 Files selected for processing (2)

• installation/downloads/docker.md
• vale-styles/FluentBit/Spelling-exceptions.txt

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📝 Walkthrough

Walkthrough

The Windows container documentation now covers Server Core and Nano Server tags, Windows Server 2025 availability, Nano Server limitations, default configuration, and image retrieval. The Vale spelling exceptions include Nano.

Changes

Windows container documentation

Layer / File(s)	Summary
Document Windows container images installation/downloads/docker.md, vale-styles/FluentBit/Spelling-exceptions.txt	The documentation adds Windows container tag patterns, availability details, Nano Server limitations, default configuration, and a docker pull example. Vale accepts Nano as a spelling exception.

Estimated code review effort: 2 (Simple) | ~10 minutes

Possibly related PRs

• fluent/fluent-bit-docs#2662: Documents the Windows Server 2025 and Nano Server images introduced with Fluent Bit 5.1.

Suggested reviewers: patrick-stephens, cosmo0920, fluent-bot

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and specifically summarizes the Docker documentation changes for Windows Server 2025 and Nano Server images.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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[eschabell]

@patrick-stephens ready for review!