Fixed format of network changelog item

cardano-node/ChangeLog.md

@@ -15,7 +15,7 @@ None
 - New P2P topology file format. See [issue #4563][#4563] or the [config
   files][understanding-config-files] documentation. The old P2P topology
   format will be supported for next two major releases of the node (the last
-  supported major version will be `1.37`).
+  supported major version will be `1.37`). (#4563)
 
 [#4563]: https://github.com/input-output-hk/cardano-node/issues/4563
 [understanding-config-files]: https://github.com/input-output-hk/cardano-node/blob/master/doc/getting-started/understanding-config-files.md