docs: minor documentation formatting update

[thanhdatloveyou18-coder]

This PR addresses minor formatting issues and cleans up trailing whitespace to improve readability.

[github-actions]

Welcome to Cal.diy, @thanhdatloveyou18-coder! Thanks for opening this pull request.

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• This is Cal.diy, not Cal.com. Cal.diy is a community-driven, fully open-source fork of Cal.com licensed under MIT. Your changes here will be part of Cal.diy — they will not be deployed to the Cal.com production app.
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[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: ab878713-d993-4e2c-ac95-9a1eb0a63abc

📥 Commits

Reviewing files that changed from the base of the PR and between fb01494 and a6489d0.

📒 Files selected for processing (1)

• README.md

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📝 Walkthrough

Walkthrough

This PR applies a formatting-only change to README.md. Blank lines and an HTML comment (<!-- Formatting update -->) are added after the final entry in the Acknowledgements section at lines 832–834. No functional content is modified, and no public APIs or exported entities are altered.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title accurately describes the main change: a minor documentation formatting update to README.md, which aligns with the actual changes made.
Description check	✅ Passed	The description is directly related to the changeset, mentioning minor formatting issues and trailing whitespace cleanup, which matches the actual changes in README.md.
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.

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