GCP credential file wrong documentation

[Srikara369]

Hi all. When validating the gcp using credential file, Documentation asks to provide in following format

{
    "project": "",
    "client_email": "",
    "private_key": ""
}

But, according to index.js file, if you are passing a credential file, you are expected to provide

{
    "project_id": "",
    "client_email": "",
    "private_key": ""
}

Please fix this error