Fix link formatting

notes.md

@@ -101,7 +101,7 @@ need followup.
   commit and its becoming public can be seen?  Karl guesses that they
   do preserve all the metadata, but we should check.)
 
-* OPSI ["co-funding"](https://www.opsi.org/de/dokumentation/opsi-lizenz-und-copyright https://forum.opsi.org/viewtopic.php?t=1193)
+* OPSI ["co-funding"](https://www.opsi.org/de/dokumentation/opsi-lizenz-und-copyright) (see also [this forum link](https://forum.opsi.org/viewtopic.php?t=1193))
 
 * [OTRS](https://www.znuny.org/en/blog/why) (open source -> delayed ->
   proprietary), but one person said that the announced delayed open release