The install-config.yaml example in section "Create the preferred configuration input" contains two errors:
1) compute is an array, so there should be a "-" on the first line
2) 192.168.111.0/16 is not a valid cidr

4.13

$ cat << EOF > ./my-cluster/install-config.yaml
...
compute:
  architecture: amd64
...
networking:
  machineNetwork:
  - cidr: 192.168.111.0/16

$ cat << EOF > ./my-cluster/install-config.yaml
...
compute:
- architecture: amd64
...
networking:
  machineNetwork: 
  - cidr: 192.168.0.0/16