Update snapshot docs

[blackmountainb]

Summary

Documents the new formats parameter on the Browser Run /snapshot endpoint, which lets users control which representations of a page are returned in a single request.

Changes:

• src/content/docs/browser-rendering/rest-api/snapshot/index.mdx
• Updated the opening paragraph to reflect that /snapshot can now return up to four representations (HTML content, screenshot, Markdown, accessibility tree), not just HTML + screenshot.
• Added a new "Choose which outputs to return" section under Advanced usage, explaining the formats parameter, the accepted values (content, screenshot, markdown, accessibilityTree), the default (["content", "screenshot"]), and the constraint that at least two formats must be requested (single-format requests should use the dedicated endpoints).
• Includes a curl example combining screenshot, markdown, and accessibilityTree, plus a sample JSON response.
• Changelog entry announcing the new formats parameter, linking to the updated /snapshot docs.

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.

[cloudflare-docs-bot]

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⚠️ 2 warnings found in commit 883370b.

Warnings (2)

File	Issue
browser-run/quick-actions/snapshot.mdx line 162	Escape angle brackets in MDX prose — Line adds unescaped < in prose: curl -X POST 'https://api.cloudflare.com/client/v4/accounts/<accountId>/browser-rendering/snapshot' \ Fix: Replace < with &lt; or wrap the text in backticks.
browser-run/quick-actions/snapshot.mdx line 163	Escape angle brackets in MDX prose — Line adds unescaped < in prose: -H 'Authorization: Bearer <apiToken>' \ Fix: Replace < with &lt; or wrap the text in backticks.

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