##### SUMMARY
As @k3x pointed out in #63374 the examples in `vmware_host_dns` miss a required parameter.

##### ISSUE TYPE
- Documentation Report

##### COMPONENT NAME
vmware_host_dns

##### ANSIBLE VERSION
```
ansible 2.10.0.dev0
  config file = None
  configured module search path = [u'/home/mario/.ansible/plugins/modules', u'/usr/share/ansible/plugins/modules']
  ansible python module location = /home/mario/rme/ansible/lib/ansible
  executable location = /home/mario/rme/ansible/bin/ansible
  python version = 2.7.16 (default, Oct 10 2019, 22:02:15) [GCC 8.3.0]
```
"""Class to manage DNS configuration of an ESXi host system"""
    def __init__(self, module):
        super(VmwareHostDNS, self).__init__(module)
        self.cluster_name = self.params.get('cluster_name')
        self.esxi_host_name = self.params.get('esxi_hostname')
        if self.is_vcenter():
            if not self.cluster_name and not self.esxi_host_name:
                self.module.fail_json(
                    msg="You connected to a vCenter but didn't specify the cluster_name or esxi_hostname you want to configure."
                )
        else:
            if self.cluster_name:
                self.module.warn(
                    "You connected directly to an ESXi host, cluster_name will be ignored."
                )
            if self.esxi_host_name:
                self.module.warn(
                    "You connected directly to an ESXi host, esxi_host_name will be ignored."
                )
        self.hosts = self.get_all_host_objs(cluster_name=self.cluster_name, esxi_host_name=self.esxi_host_name)
        if not self.hosts:
            self.module.fail_json(msg="Failed to find host system(s).")
        self.network_type = self.params.get('type')
        self.vmkernel_device = self.params.get('device')
        self.host_name = self.params.get('host_name')
        self.domain = self.params.get('domain')
        self.dns_servers = self.params.get('dns_servers')
        self.search_domains = self.params.get('search_domains')
    def ensure(self):