docs: 固有名詞を正式名称に統一

[TwoSquirrels]

ドキュメント中の固有名詞を正式名称に揃えます。

修正前	修正後	根拠
Nyaan Library	Nyaan's Library	正式名称 (README ベンチマーク表、両言語)
AtCoder Library	AC Library	本家リポジトリ README・公式ドキュメントの自称。risundle 内の他の箇所も AC Library で統一済みだった (チートシート両言語の各 1 箇所のみ揺れ)
WSL2	WSL 2	Microsoft 公式表記 (README ベンチマーク環境、両言語)

コード変更はありません。

🤖 Generated with Claude Code

https://claude.ai/code/session_01TwiopnwyFnRbSUyNoFLWAZ

Summary by CodeRabbit

• Documentation
  • Updated benchmark wording and table labels for clearer, more consistent naming.
  • Refined spacing and formatting in the benchmarks section.
  • Replaced example library names in the cheatsheet with the newer AC Library wording in both languages.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 59cab510-c9a5-4a4a-b422-28073a9f7468

📥 Commits

Reviewing files that changed from the base of the PR and between e40d3a4 and 8126f01.

📒 Files selected for processing (4)

• README.ja.md
• README.md
• docs/cheatsheet.ja.md
• docs/cheatsheet.md

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📝 Walkthrough

Walkthrough

Minor documentation text updates across README.md, README.ja.md, docs/cheatsheet.md, and docs/cheatsheet.ja.md: benchmark environment wording changed ("WSL2" to "WSL 2") and library naming updated ("Nyaan Library" to "Nyaan's Library", "AtCoder Library" to "AC Library"). No code or public entity changes.

Changes

Documentation text updates

Layer / File(s)	Summary
Benchmark section wording README.md, README.ja.md	Updated "WSL2" to "WSL 2" and renamed "Nyaan Library" to "Nyaan's Library" in benchmark comparison sections, with minor table formatting adjustments.
Cheatsheet example library reference docs/cheatsheet.md, docs/cheatsheet.ja.md	Changed example library reference from "AtCoder Library" to "AC Library" in the unexpanded #include guidance section.

Estimated code review effort: 1 (Trivial) | ~2 minutes

🚥 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 accurately summarizes the documentation-only change to standardize proper nouns to their official names.
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
• Commit unit tests in branch proper-nouns

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