fix gcloud dev machine setup docs
fix gcloud dev machine setup docs

Signed-off-by: Tobias Pfandzelter <aa048cf5da7f2c8e6f98620ad42998abdc2682de@campus.tu-berlin.de>

firecracker-microvm/firecracker,firecracker-microvm/firecracker,firecracker-microvm/firecracker,firecracker-microvm/firecracker,firecracker-microvm/firecracker