message: Add PR links to changelog items and rearrange slightly.
diff: ### Bugfixes
  * Fix for creating process-shared mutex objects in the wrong kernel object namespace on UWP.
  - PR [#2579](https://github.com/realm/realm-core/pull/2579)
  + PR [#2579](https://github.com/realm/realm-core/pull/2579).
  ### Breaking changes
  * Add `Group::compute_aggregated_byte_size()` and
  `Table::compute_aggregated_byte_size()` for debugging/diagnostics purposes.
  -* Add a templated version of Table::set() to go with Table::get().
  -* Add TableView::find_first_timestamp().
  -* Add TableView::find_first<T>().
  -* Make Table::find_first<T>() public and add support for most column types.
  -* Add wrappers for Table::set<T>() to Row.
  -* Add support for all column types in Table::get<T>().
  + PR [#2591](https://github.com/realm/realm-core/pull/2591).
  +* `Table` and `TableView` refactoring and improvements.
  + PR [#2571](https://github.com/realm/realm-core/pull/2571).
  + * Add a templated version of `Table::set()` to go with `Table::get()`.
  + * Add `TableView::find_first_timestamp()`.
  + * Add `TableView::find_first<T>()`.
  + * Make `Table::find_first<T>()` public and add support for most column types.
  + * Add wrappers for `Table::set<T>()` to `Row`.
  + * Add support for all column types in `Table::get<T>()`.
  -----------
  * Make `Array::stats()` available in release mode builds (not just in debug mode
  builds).
  + PR [#2591](https://github.com/realm/realm-core/pull/2591).
  ----------------------------------------------
  