fix(kv): Link to new nested API URLs for kv

[shrink]

Summary

I was browsing the kv documentation and encountered some 404s when clicking through to the API documentation. The problem looks to be caused by the introduction of nesting in the kv API documentation, e.g:

- /api/resources/kv/subresources/namespaces/methods/bulk_delete/
+ /api/resources/kv/subresources/namespaces/subresources/keys/methods/bulk_delete/

While making this PR, I found broken links in the kv release notes, so I fixed them... but not sure if editing release notes after the fact is bad. I can remove that change if it's not good.

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PR Change Summary

Updated KV API documentation to correct broken links caused by API nesting changes and fixed additional broken links in release notes.

• Corrected API URLs in multiple documentation files to reflect new nesting structure.
• Fixed broken links in the KV release notes.
• Updated references to the REST API for bulk operations.

Modified Files

• src/content/docs/kv/api/delete-key-value-pairs.mdx
• src/content/docs/kv/api/write-key-value-pairs.mdx
• src/content/docs/kv/index.mdx
• src/content/docs/kv/platform/pricing.mdx
• src/content/docs/kv/reference/faq.mdx
• src/content/docs/kv/workers-kv-api.mdx

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[Oxyjun]

@shrink Thank you so much for catching these links!

I've approved + enabled auto-merge.

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