Add troubleshooting step for skipped certificates.
Add troubleshooting step for skipped certificates.

During the reconfiguration of GitLab, the custom certificates in /etc/gitlab/trusted-certs  might get skipped for symlinking.
If the certificate contains the string 'TRUSTED' then removing the string from the certificate can help to resolve this.
gitlabhq/omnibus-gitlab,gitlabhq/omnibus-gitlab,gitlabhq/omnibus-gitlab,gitlabhq/omnibus-gitlab