message: Update RELEASE_NOTES for 1.9.2
diff: This file contains one line summaries of commits that are worthy of mentioning in release notes.
  A new header is inserted each time a *tag* is created.
  -## Next release
  +## Next release (v1.9.4)
  +
  +## v1.9.3
  ## v1.9.2
  +- Fixes / improvements for contact shadows, fog, and DOF
  +- Reduce SSAO creases caused by geometry tessellation
  +- Fix compilation warnings and issue with Clang 12
  +- Fix JNI crashes
  +- Rename .blurScale to .cocScale in DOF options
  +
  ## v1.9.1
  - Improvements to SSAO quality
  