Add documentation key to system unit file

debian/patches/local.add-systemd-documentation-key.patch

@@ -0,0 +1,14 @@
+Subject: Add documentation key to system unit file
+Author: Christoph Biedl <debian.axhn@manchmal.in-ulm.de>
+Date: 2018-08-12
+Forwarded: not-yet
+
+--- a/units/tangd@.service.in
++++ b/units/tangd@.service.in
+@@ -1,5 +1,6 @@
+ [Unit]
+ Description=Tang Server
++Documentation=man:tangd(8)
+ 
+ [Service]
+ StandardInput=socket

debian/patches/series

@@ -1 +1,2 @@
 local.use-asciidoctor-to-build-manpages.patch
+local.add-systemd-documentation-key.patch