fix(doc): Update documentation for resource proxmox_virtual_environment_firewall_ipset

[pescobar]

I tried to add an ipset following the docs in https://github.com/bpg/terraform-provider-proxmox/blob/main/docs/resources/virtual_environment_firewall_ipset.md but I got this error:

 Error: Invalid resource type
│
│   on infra/proxmox-firewall/cluster-wide-ipsets.tf line 1, in resource "proxmox_virtual_environment_cluster_firewall_ipset" "admin_hosts":
│    1: resource "proxmox_virtual_environment_cluster_firewall_ipset" "admin_hosts" {
│
│ The provider bpg/proxmox does not support resource type "proxmox_virtual_environment_cluster_firewall_ipset".

Reviewing the code I noticed that the resource name is proxmox_virtual_environment_firewall_ipset and not proxmox_virtual_environment_cluster_firewall_ipset as mentioned in the docs. This PR fixes the docs.

It works when using resource "proxmox_virtual_environment_firewall_ipset" to add a cluster ipset. I haven't tested it at the VM level.

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[bpg]

Good catch, thanks @pescobar!