message: fix documentation for lights (ospNewLight() was deprecated in v1.5.0)
diff: @@ -16,6 +16,9 @@ Version History
  - Added sheenTint parameter to Principled material
  - Added baseNormal parameter to Principled material
  - Added low-discrepancy sampling to path tracer
  +- Fixed documentation for `ospNewLight()`, which was replaced in v1.5.0 with
  + `ospNewLight2()` in the same way `ospNewMaterial()` was replaced by
  + `ospNewMaterial2()`
  ### Changes in v1.6.1:
  