Added info about scene properties changes

Author: ivan-perevala

docs/pages/release_notes/v4.2.2.md

@@ -1,3 +1,7 @@
 # Multiple Camera Render 4.2.2 Release Notes
 
 * Created [documentation on ReadTheDocs](https://multiple-camera-render.readthedocs.io/latest/) platform. It should provide more clear information about how to use the addon, how to submit issues and about libraries used by this project.
+
+* Minor fixes for scene properties:
+    - None of them are supposed to be animated as far as they are evaluated only at initialization of multiple camera rendering, so that fixed now.
+    - Added missing description for ``Cameras Usage`` property.