Description of problem:
Documentation bug at https://access.redhat.com/documentation/en/red-hat-openstack-platform/8/paged/director-installation-and-usage/chapter-9-scaling-the-overcloud

at section 9.1. ADDING COMPUTE OR CEPH STORAGE NODES on the newnodes.json file. 

Version-Release number of selected component (if applicable):
RH OSP 8.0 director documentation.

How reproducible:
100%

Steps to Reproduce:
1. JSON file format is wrong. Import fails. 
2.
3.

Actual results:
File example is :


{
"nodes":[
    {
        "mac":[
            "dd:dd:dd:dd:dd:dd"
        ],
        "cpu":"4",
        "memory":"6144",
        "disk":"40",
        "arch":"x86_64",
        "pm_type":"pxe_ipmitool",
        "pm_user":"admin",
        "pm_password":"p@55w0rd!",
        "pm_addr":"192.0.2.207"
    },
    {
        "mac":[
            "ee:ee:ee:ee:ee:ee"
        ],
        "cpu":"4",
        "memory":"6144",
        "disk":"40",
        "arch":"x86_64",
        "pm_type":"pxe_ipmitool",
        "pm_user":"admin",
        "pm_password":"p@55w0rd!",
        "pm_addr":"192.0.2.208"
    },
]
}

Expected results:
File should not contain a comma at the end of the last json object : 

{
"nodes":[
    {
        "mac":[
            "dd:dd:dd:dd:dd:dd"
        ],
        "cpu":"4",
        "memory":"6144",
        "disk":"40",
        "arch":"x86_64",
        "pm_type":"pxe_ipmitool",
        "pm_user":"admin",
        "pm_password":"p@55w0rd!",
        "pm_addr":"192.0.2.207"
    },
    {
        "mac":[
            "ee:ee:ee:ee:ee:ee"
        ],
        "cpu":"4",
        "memory":"6144",
        "disk":"40",
        "arch":"x86_64",
        "pm_type":"pxe_ipmitool",
        "pm_user":"admin",
        "pm_password":"p@55w0rd!",
        "pm_addr":"192.0.2.208"
    }
]
}

Additional info:

Please remove the comma after the last node definition.