man: add missing spdx header

diff --git a/man/systemd.dnssd.xml b/man/systemd.dnssd.xml
index dc00591fcde0d95a04478d0e4b6a701cf9400ad2..7538a463f929b068745a3f60ef8017a77158ecde 100644 (file)
--- a/man/systemd.dnssd.xml
+++ b/man/systemd.dnssd.xml
@@ -1,9 +1,7 @@
 <?xml version='1.0'?>
 <!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN"
   "http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
-
-<!--
--->
+<!-- SPDX-License-Identifier: LGPL-2.1+ -->
 
 <refentry id="systemd.dnssd" conditional='ENABLE_RESOLVE'>