Brush Mask Filter: Height - UI accepts values outside of documented 0..1 range which can be confusing to users when values outside of this range appear to be ignored.

Link to documentation: https://docs.unity3d.com/Packages/com.unity.terrain-tools@3.0/manual/brush-mask-filters-list.html

steps (with terrain tools installed)
1. add new terrain object and select it
2. use inspector to view terrain properties
3. add brush mask filter for height
4. set min value = 10, max value = 20

results: no painting occurs as min/max value range is documented to go from 0..1.
expected results: UI restricts min/max values to useful range

Issue found using macOS and Unity Editor:
Version: 2020.2.0b7.3288
Revision: 2020.2/staging 1b1252580c64
Built: Tue, 06 Oct 2020 02:13:03 GMT