Replace missing for failed replica typo

[taikaa]

Describe the Change You Would Like

It appears there is a typo in this step, puppet infrastructure forget <replacement-replica-fqdn> should be puppet infrastructure forget <replacement-former-fqdn>

https://github.com/puppetlabs/puppetlabs-peadm/blob/main/documentation/recovery.md#replace-missing-or-failed-replica-puppet-server