Remove Trailing White space in Kubernetes Doc (#3360)
Remove Trailing White space in Kubernetes Doc (#3360)

Removed a trailing white space from which caused `Error loading data: Invalid key/value pair ' ': format must be key=value` if copying the example

```
vault write auth/kubernetes/role/demo \
    bound_service_account_names=vault-auth \
    bound_service_account_namespaces=default \
    policies=default \
    ttl=1h
```
Aloomaio/vault,mgk/vault,quixoten/vault,joelthompson/vault,quixoten/vault,lemondrank/vault,hashicorp/vault,joelthompson/vault,kingland/vault,hashicorp/vault,kingland/vault,kingland/vault,mgk/vault,quixoten/vault,lemondrank/vault,hartsock/vault,rnaveiras/vault,hashicorp/vault,hartsock/vault,hashicorp/vault,Aloomaio/vault,joelthompson/vault,hashicorp/vault,kingland/vault,Aloomaio/vault,joelthompson/vault,mgk/vault,rnaveiras/vault,hashicorp/vault,hartsock/vault,hartsock/vault,hartsock/vault,naunga/vault,naunga/vault,kingland/vault,Aloomaio/vault,quixoten/vault,mgk/vault,rnaveiras/vault,rnaveiras/vault,rnaveiras/vault