Steps to reproduce:

1. Config two or more addresses on Server option
2. Try to start the proxy

Result:

/usr/local/sbin/zabbix_proxy -c /usr/local/etc/zabbix4/zabbix_proxy.conf
zabbix_proxy [32462]: ERROR: invalid "Server" configuration parameter: '177.XX.XXX.XX,172.16.1.50,10.0.5.50'

Expected:

### Option: Server
[...]
#     List of comma delimited IP addresses, optionally in CIDR notation, or DNS names of }}{{Zabbix server.
#     Incoming connections will be accepted only from the addresses listed here.
#     If IPv6 support is enabled then '127.0.0.1', '::127.0.0.1', '::ffff:127.0.0.1' are treated equally
#     and '::/0' will allow any IPv4 or IPv6 address.
#     '0.0.0.0/0' can be used to allow any IPv4 address.
#     Example: Server=127.0.0.1,192.168.1.0/24,::1,2001:db8::/32,zabbix.example.com
[...]
# Server=