Commit
83f72cd65fb8 ("man,docs: document the new unit file directory for
attached images") updated the docs and man page with the new unit file
directory for attached images but included a system.attached ->
systemd.attached typo in the man page portion of the change. Fix the
typo to document the correct path.
<filename>/run/systemd/transient/*</filename>
<filename>/run/systemd/generator.early/*</filename>
<filename>/etc/systemd/system/*</filename>
-<filename>/etc/systemd/systemd.attached/*</filename>
+<filename>/etc/systemd/system.attached/*</filename>
<filename>/run/systemd/system/*</filename>
-<filename>/run/systemd/systemd.attached/*</filename>
+<filename>/run/systemd/system.attached/*</filename>
<filename>/run/systemd/generator/*</filename>
<filename index='false'>…</filename>
<filename>/usr/lib/systemd/system/*</filename>