message: misc: fix changelog formatting
diff: - [Implemented `Vector.distinct` allowing to remove duplicate elements from a
  Vector][3224]
  - [Implemented `Duration.time_execution` allowing timing of the execution of an
  -- expression within the UI][3229]
  + expression within the UI][3229]
  - [Improved performance of `Vector.filter` and `Vector.each`; implemented
  `Vector.filter_with_index`. Made `Vector.at` accept negative indices and
  ensured it fails with a dataflow error on out of bounds access instead of an
  