[KV]Update routing-with-workers-kv.mdx

[nenizera]

Hello team,

Summary

To clarify the concept Blue-green deployment.

Thanks!

[hyperlint-ai]

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PR Change Summary

Clarified the concept of blue-green deployment in the documentation.

• Updated the routing section to include a link to blue-green deployments
• Enhanced the explanation of routing for external applications

Modified Files

• src/content/docs/kv/examples/routing-with-workers-kv.mdx

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