Create Role example is wrong

The create role example is wrong
this is how it is:
{
    "name":""
}

and it should be:
{
    "roles": {
        "name":""
    }
}

Change-Id: I725f04b582b01f53178b010e8226b9d60913ae6d
Closes-bug: 1261722
Merge "Create Role example is wrong"