[BRAPI]Markdown endpoint docs

[daisyfaithauma]

Summary

• Markdown docs

Screenshots (optional)

Documentation checklist

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• If a larger change - such as adding a new page- an issue has been opened in relation to any incorrect or out of date information that this PR fixes.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

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PR Change Summary

Updated documentation to include a new Markdown extraction endpoint and modified the sidebar order for the API reference.

• Added documentation for the new /markdown endpoint that converts webpage content to Markdown format.
• Updated the sidebar order for the API reference section.

Modified Files

• src/content/docs/browser-rendering/rest-api/api-reference.mdx

Added Files

• src/content/docs/browser-rendering/rest-api/markdown-endpoint.mdx

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[github-actions]

Preview URL: https://f12b812c.preview.developers.cloudflare.com
Preview Branch URL: https://markdown-endpoint.preview.developers.cloudflare.com

Files with changes (up to 15)

Original Link	Updated Link
https://developers.cloudflare.com/browser-rendering/rest-api/markdown-endpoint/	https://markdown-endpoint.preview.developers.cloudflare.com/browser-rendering/rest-api/markdown-endpoint/
https://developers.cloudflare.com/browser-rendering/rest-api/api-reference/	https://markdown-endpoint.preview.developers.cloudflare.com/browser-rendering/rest-api/api-reference/