Add missing man files to -container

Patch from mihkulemin@gmail.com.
diff --git a/systemd.spec b/systemd.spec
index f9bab01..0516c91 100644
--- a/systemd.spec
+++ b/systemd.spec
@@ -939,7 +939,9 @@
 %{_datadir}/bash-completion/completions/systemd-nspawn
 %{_datadir}/zsh/site-functions/_machinectl
 %{_datadir}/zsh/site-functions/_systemd-nspawn
-%{_mandir}/man[1578]/systemd-machined*
+%{_mandir}/man1/machinectl.*
+%{_mandir}/man8/systemd-machined.*
+%{_mandir}/man8/*mymachines.*
 
 %files journal-remote
 %config(noreplace) %{_sysconfdir}/systemd/journal-remote.conf