Go tutorials are referencing old project layout

[maxcao13]

What is the URL of the document?

https://sdk.operatorframework.io/docs/building-operators/golang/tutorial/
https://sdk.operatorframework.io/docs/building-operators/golang/migration/
...etc

Which section(s) is the issue in?

Create a new API and Controller (tutorial)
What was changed (migration)

What needs fixing?

I think the documentation that references controllers and main.go is old. Seems like when I do operator-sdk init and operator-sdk create api, it generates cmd/main.go and internal/..._controller.go. Not sure which one is wrong, the docs or the init, but I'm guessing it's the docs.

Additional context

I think there's more cases of the wrong project layout being referenced in the docs.
Operator-sdk version:

operator-sdk version: "v1.36.1", commit: "37d2f2872bfecd6927469f384be4951805aa4caa", kubernetes version: "1.29.0", go version: "go1.21.12", GOOS: "linux", GOARCH: "amd64"

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