Update field requirements

[AmandaHassoun]

Terraform apply was complaining that the project field was required, so updating the docs accordingly

[emilymye]

Hi @AmandaHassoun - while overall the project is required for creating the service account, it is optional on the resource because we allow for provider-default values. i.e. it's possible to do

provider "google" {
   project = "my-project"
}

resource  "google_service_account" {
    name = "my-sa-name"
}

where project isn't provided and thus optional for the service account.

I'm going to close this PR but feel free to re-open if you have other questions!

[AmandaHassoun]

thanks @emilymye

[ghost]

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