Enhance documentation with Cloudflare Trace tool note

[gguuss]

Added note about the Cloudflare Trace tool for testing tunnels.

Summary

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• If a larger change - such as adding a new page- an issue has been opened in relation to any incorrect or out of date information that this PR fixes.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 67c8b32.

Code Review

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Command	Description
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[cloudflare-docs-bot]

Review coverage

🟡 1 ownership area needs approval.

Suggested reviewers: @nikitacano

Needs approval	Eligible approvers	Suggested
tunnel	@nikitacano, @cloudflare/appsec-reviewers, @cloudflare/product-owners	nikitacano

CODEOWNERS mappings for displayed areas (1)

Pattern	Owners
/src/content/docs/tunnel/	@nikitacano, @cloudflare/appsec-reviewers, @cloudflare/product-owners