Better document DevPlat support in China Network

[WalshyDev]

Summary

There's confusion over what products are available over China Network. Availability is sourced from our internal wiki + what I could find in chats. Information may not be 100%, have not yet validated.

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• If a larger change - such as adding a new page- an issue has been opened in relation to any incorrect or out of date information that this PR fixes.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

[hyperlint-ai]

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PR Change Summary

Enhanced documentation for DevPlat support in the China Network by updating product availability and descriptions.

• Updated the product availability table to reflect current offerings in the China Network.
• Added descriptions for new and existing products, indicating their availability status.

Modified Files

• src/content/docs/china-network/reference/available-products.mdx

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[github-actions]

This pull request requires reviews from CODEOWNERS as it changes files that match the following patterns:

Pattern	Owners
/src/content/docs/china-network/	@pedrosousa, @cloudflare/pcx-technical-writing

[github-actions]

Preview URL: https://d99bca18.preview.developers.cloudflare.com
Preview Branch URL: https://walshy-devplat-china.preview.developers.cloudflare.com

Files with changes (up to 15)

Original Link	Updated Link
https://developers.cloudflare.com/china-network/reference/available-products/	https://walshy-devplat-china.preview.developers.cloudflare.com/china-network/reference/available-products/