message: update references to markdown format
diff: ### Bugfixes
  * Fixed a few bugs (caused crashes) in pthread library on UWP.
  -* Fixes a bug in chuncked binary column returning null value (#2418)
  +* Fixes a bug in chuncked binary column returning null value.
  + Issue [#2418](https://github.com/realm/realm-core/pull/2418).
  * Possibly fixed some cases of extreme file size growth, by preventing starvation
  when trying to start a write transaction, while simultaneously pinning an older
  - version. (issue #2395)
  -* Fixed a bug when deleting a column used in a query (#2408)
  + version. [#2395](https://github.com/realm/realm-core/pull/2395)
  +* Fixed a bug when deleting a column used in a query [#2408](https://github.com/realm/realm-core/pull/2408)
  * Fixed a crash that occurred if you tried to override a binary with a size close
  to the limit.
  * `seekpos()` and `seekoff()` in `realm::util::MemoryInputStreambuf` now behave
  