Add read config endpoint docs (#5790)
Add read config endpoint docs (#5790)

* Add read config endpoint docs

* fix response code, remove empty fields from sample response

hashicorp/vault,joelthompson/vault,rnaveiras/vault,rnaveiras/vault,kingland/vault,kingland/vault,hashicorp/vault,kingland/vault,hashicorp/vault,kingland/vault,joelthompson/vault,hartsock/vault,hashicorp/vault,rnaveiras/vault,kingland/vault,joelthompson/vault,hartsock/vault,hartsock/vault,quixoten/vault,quixoten/vault,rnaveiras/vault,quixoten/vault,rnaveiras/vault,hartsock/vault,quixoten/vault,hashicorp/vault,hashicorp/vault,joelthompson/vault,hartsock/vault