Update index.html.md (#4372)
Update index.html.md (#4372)

Remove duplicate of max_ttl description from end of period description under create role parameters.
hartsock/vault,kingland/vault,hashicorp/vault,hashicorp/vault,Aloomaio/vault,kingland/vault,joelthompson/vault,joelthompson/vault,quixoten/vault,rnaveiras/vault,mgk/vault,hartsock/vault,hashicorp/vault,rnaveiras/vault,kingland/vault,mgk/vault,Aloomaio/vault,hartsock/vault,hashicorp/vault,hashicorp/vault,rnaveiras/vault,Aloomaio/vault,hartsock/vault,quixoten/vault,hashicorp/vault,mgk/vault,joelthompson/vault,Aloomaio/vault,kingland/vault,joelthompson/vault,kingland/vault,quixoten/vault,mgk/vault,hartsock/vault,rnaveiras/vault,quixoten/vault,rnaveiras/vault