That's the legacy perl api documentation,in order to use it you must be working in Perl, using the Infoblox Perl module.

you'll want to use the WAPI documentation for Web API work.

https://ipam.illinois.edu/wapidoc/

You should be sending this JSON data:

{
    "scavenging_settings": 
    {
        "enable_zone_last_queried": true
    }
}

In Postman it will look like this: