[Docs][Go] stale reference in code generated by 'genkit init'

[eliben]

Is your report related to a problem? Please describe.
Following the tutorial at https://firebase.google.com/docs/genkit-go/get-started-go, the generated code has:

	// Initialize the Google AI plugin. When you pass an empty string for the
	// apiKey parameter, the Google AI plugin will use the value from the
	// GOOGLE_GENAI_API_KEY environment variable, which is the recommended
	// practice.
	if err := googleai.Init(ctx, nil); err != nil {
		log.Fatal(err)
	}

However, there's no "apiKey" parameter. It now seems to be a field on https://pkg.go.dev/github.com/firebase/genkit/go@v0.1.0/plugins/googleai#Config, and nil is passed

[thedmail]

What's the actual desired docs change here?