Update dice example to use logs

[pellared]

Update https://opentelemetry.io/docs/languages/go/getting-started/ and https://github.com/open-telemetry/opentelemetry-go/tree/main/example/dice to use logs signal.

[Enzujp]

Hello there @pellared , if this is still unattended, I'd like to fix it!

[pellared]

@open-telemetry/go-maintainers and @open-telemetry/docs-maintainers: Is it OK to do it before having a stable release of OTel Go Logs?

[svrnm]

From a docs perspective, that's OK, we had that for other languages in the past as well, you might want to add a disclaimer that things are still in beta.

[MrAlias]

Code update: #5349