Add additional info for worker service binding rpc example

[ToriLindsay]

Fixes #17421
The main issue raised in #17421 was the lack of default which was fixed by #18163 . So, I think the only thing left to do is to add some additional context for the example.

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PR Change Summary

Enhanced the RPC example for service binding by adding additional context and clarifications.

• Added context for the RPC-based Service bindings example
• Clarified the usage of the WorkerEntrypoint class in the example
• Updated the example to improve understanding of service binding communication

Modified Files

• src/content/docs/workers/runtime-apis/bindings/service-bindings/index.mdx

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[github-actions]

Preview URL: https://36f719bc.preview.developers.cloudflare.com
Preview Branch URL: https://tori-pcx17421-add-service-workers-link-from-service-bindings.preview.developers.cloudflare.com

Files with changes (up to 15)

Original Link	Updated Link
https://developers.cloudflare.com/workers/runtime-apis/bindings/service-bindings/	https://tori-pcx17421-add-service-workers-link-from-service-bindings.preview.developers.cloudflare.com/workers/runtime-apis/bindings/service-bindings/

[ToriLindsay]

Hi @GregBrimble - Would you mind reviewing this one to see if I'm adding accurate, helpful context? (I just made my best guess). Thank you!

[GregBrimble]

LGTM. I think RPC does also kinda work without using the WorkerEntrypoint class (we recently went on an exploration for this here), but it is a much better when using WorkerEntrypoint, so I'm more than happy to push that here in the docs.