[TerrainTools] Tooltips are missing for the properties of Export Noise to Texture settings.

In the Noise Editor window, Tooltips are missing for “Texture Type”, “Dimension” and “Texture Format” properties of Export Noise to Texture settings.

Steps to Repro:
1. Create a new Project
2. Add package Terrain Tool 4.0.0
3. Windows > Terrain > Edit Noise
4. Observe that the Tooltips are missing

Expected Result: Tooltip appears when the mouse has hovered on the properties

Actual Result: Tooltips are missing

Reproducible in: 2021.2.0a19, 2020.3.11f1, 2019.4.28f1 with the package version 4.0.0 Pre 2 RC, 3.0.2 pre.3, 3.0.1 pre, 3.0.0 pre 2.0.0.pre

Environment: Windows 10 and macOS 11.3

Note: Noise Editor window is introduced in package version 2.0.0 pre