Fix incorrect parameter name in docs (#5793)
Fix incorrect parameter name in docs (#5793)

Fixes https://github.com/hashicorp/vault-plugin-auth-gcp/issues/56
kingland/vault,rnaveiras/vault,hartsock/vault,hartsock/vault,rnaveiras/vault,rnaveiras/vault,kingland/vault,joelthompson/vault,quixoten/vault,rnaveiras/vault,kingland/vault,kingland/vault,hashicorp/vault,quixoten/vault,kingland/vault,hashicorp/vault,hashicorp/vault,hashicorp/vault,hashicorp/vault,joelthompson/vault,rnaveiras/vault,quixoten/vault,hartsock/vault,hartsock/vault,joelthompson/vault,hashicorp/vault,joelthompson/vault,hartsock/vault,quixoten/vault