fix: add newline for 'Use Agents with Workflows for:' sub section

[CollierKing]

Summary

Adds newline to jumbled content/section header
https://developers.cloudflare.com/agents/concepts/workflows/

Screenshots (optional)

Documentation checklist

• Is there a changelog entry (guidelines)? If you don't add one for something awesome and new (however small) — how will our customers find out? Changelogs are automatically posted to RSS feeds, the Discord, and X.
• The change adheres to the documentation style guide.
• If a larger change - such as adding a new page- an issue has been opened in relation to any incorrect or out of date information that this PR fixes.
• Files which have changed name or location have been allocated redirects.

[cloudflare-docs-bot]

Review

✅ No issues found in commit 625c7fe.

Code Review

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✅ No code review issues found.

Style Guide Review

✅ No style-guide issues found.

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