message: Fix issue number in changelog
diff: ### Bug Fixes
  -- Fixed schema URL for TSDoc preventing the use of `typedoc/tsdoc.json` in TSDoc extends, #2016.
  +- Fixed schema URL for TSDoc preventing the use of `typedoc/tsdoc.json` in TSDoc extends, #2015.
  - Fixed missing JSDoc style `@typedef` comments for properties, #2020.
  ### Thanks!
  