Update changelog oops

[ci skip]

changelog.md

@@ -16,6 +16,7 @@
  ### Add-ons server
    * Fixed undefined behavior when servicing requests to downgrade add-ons.
  ### Campaigns
+   * Added custom campaign menu backgrounds for several mainline campaigns.
    * The Rise of Wesnoth
      * Adjust campaign difficulty
  ### Multiplayer
@@ -42,7 +43,7 @@
    * Extent 'special_id_active' and 'special_type_active' to abilities used like weapon and to [leadership] abilities.
    * abilities used like weapon can call [leading_anim] now.
  ### Miscellaneous and Bug Fixes
-   * Fixed display zoom not being taken into account when using the `x`, `y`, `directional_x` and `directional_y` attributes in unit animations.
+   * Fixed display zoom not being taken into account when using the `x`, `y`, `directional_x` and `directional_y` attributes in unit animations (issue #5508).
    * Fixed a warning message and the AI leader potentially not moving when it cannot reach a keep because it's occupied by an allied unit
 
 ## Version 1.15.9