added 1823416 to disco known bugs

posts/release/disco/final/post.md

@@ -4,5 +4,9 @@ Known Bugs
 Installer
 ---------
 
- * apparently unexpected order in language selection on welcome module ([1801498](https://bugs.launchpad.net/calamares/+bug/1801498)
+ * apparently unexpected order in language selection on welcome module ([1801498](https://bugs.launchpad.net/calamares/+bug/1801498))
 
+Desktop Environment
+-------------------
+
+ * lxqt-session allocates memory for process output never read ([1823416](https://bugs.launchpad.net/ubuntu/+source/lxqt-session/+bug/1823416))