[Doc]: Update DPG versioning document to include JS RLC Code

[lirenhe]

Clear and concise description of the problem

Today, when people review: docs/howtos/DataPlane Generation - DPG/09versioning.mdx, they will find '// there's no apiVersion defined in the all the operations, TypeScript emitter will ignore it.' for TypeScript code.

The root cause is that 'apiVersion' is not defined in the operation. To make the doc more useful, I suggest to update the spec to add more 'Versioned' operation so that we could show the behavior for JS as well.

Checklist

• [X] Follow our Code of Conduct
• [X] Check that this issue is about the Azure libraries for typespec. For feature request in the typespec language or core libraries file it in the TypeSpec repo
• [X] Read the docs.
• [X] Check that there isn't already an issue that request the same feature to avoid creating a duplicate.