Fix incorrect RN used in module (#38249)

This is backported from devel as this bug makes the module fail for VMM
domains.

lib/ansible/modules/network/aci/aci_domain_to_vlan_pool.py

@@ -302,7 +302,7 @@ def main():
     elif domain_type == 'vmm':
         domain_class = 'vmmDomP'
         domain_mo = 'uni/vmmp-{0}/dom-{1}'.format(VM_PROVIDER_MAPPING[vm_provider], domain)
-        domain_rn = 'dom-{0}'.format(domain)
+        domain_rn = 'vmmp-{0}/dom-{1}'.format(VM_PROVIDER_MAPPING[vm_provider], domain)
 
     # Ensure that querying all objects works when only domain_type is provided
     if domain is None: