The nginx package does not contain the nginx man page. One is provided by upstream and should be included.
nginx-1.2.4-1.fc18 has been submitted as an update for Fedora 18. https://admin.fedoraproject.org/updates/nginx-1.2.4-1.fc18
nginx-1.0.15-3.fc16 has been submitted as an update for Fedora 16. https://admin.fedoraproject.org/updates/nginx-1.0.15-3.fc16
nginx-1.0.15-3.el6 has been submitted as an update for Fedora EPEL 6. https://admin.fedoraproject.org/updates/nginx-1.0.15-3.el6
Package nginx-1.2.4-1.fc18: * should fix your issue, * was pushed to the Fedora 18 testing repository, * should be available at your local mirror within two days. Update it with: # su -c 'yum update --enablerepo=updates-testing nginx-1.2.4-1.fc18' as soon as you are able to. Please go to the following url: https://admin.fedoraproject.org/updates/FEDORA-2012-17160/nginx-1.2.4-1.fc18 then log in and leave karma (feedback).
nginx-1.0.15-6.fc17 has been submitted as an update for Fedora 17. https://admin.fedoraproject.org/updates/FEDORA-2012-17186/nginx-1.0.15-6.fc17