message: Fixed changelog, where a bugfix in 4.0 was forgotten
diff: ### Bugfixes
  -* Lorem ipsum.
  +* Added mentioning of bugfix #2853 to this file for Core 4.0.0. (see below)
  + The mentioning of this fix for 4.0 was originally ommitted.
  ### Breaking changes
  ### Bugfixes
  +* Fix a bug in subtable management which caused crashes if a subtable was destroyed
  + on a different thread.
  + PR [#2855](https://github.com/realm/realm-core/pull/2855).
  * Fix corruption caused by `swap_rows()` and `move_column()` operations applied
  to a StringEnumColumn. Currently unused by bindings.
  PR [#2780](https://github.com/realm/realm-core/pull/2780).
  