mod_systemd.xml: add basic unit example [skip ci]
href="https://www.freedesktop.org/software/systemd/man/systemd.service.html">systemd.service(5)</a>
for more information). The module is activated if loaded.</p>
+ <example>
+ <title>Example of systemd service unit (more settings are probably needed for production systems)</title>
+ <pre>
+[Unit]
+Description=The Apache HTTP Server
+After=network.target
+
+[Service]
+Type=notify
+ExecStart=/usr/local/apache2/bin/httpd -D FOREGROUND -k start
+ExecReload=/usr/local/apache2/bin/httpd -k graceful
+ExecStop=/usr/local/apache2/bin/httpd -k graceful-stop
+
+[Install]
+WantedBy=multi-user.target
+ </pre>
+ </example>
+
+ <p>This module does not provide support for Systemd socket activation.</p>
+
<p><directive module="core">ExtendedStatus</directive> is
enabled by default if the module is loaded. If <directive
module="core">ExtendedStatus</directive> is not disabled in
