"Enable Curved UI" helpbox text describes the setting as gating the bend when it only hides the authoring fields

Steps to reproduce:

1. Create a new Unity project using the Universal 3D template
2. Open the Project Settings window (Edit > Project Settings)
3. Open the UI Toolkit tab in the Project Settings 
4. Observe the "Enable Curved UI" helpbox

Actual results: The "Enable Curved UI" help text reads "When enabled, allows bending UI Toolkit panels with the -unity-curvature style property (world-space panels)", implying the setting is what permits the bending. With the setting disabled, -unity-curvature still renders identically - a world-space panel bends the same whether the setting is on or off. The setting only controls whether the Curvature row appears in the UI Builder and Inspector.

Expected results: The help text describes what the setting actually controls and does not imply it gates the bend, e.g. "Shows the -unity-curvature property in the UI Builder and Inspector. The property itself always applies on world-space panels."

Reproducible with versions: 6000.7.0a6

Can’t test with versions: 6000.0.0f1, 6000.0.83f1, 6000.3.23f1, 6000.5.11f1, 6000.6.0f1 (due to no Curved UI feature)

Tested on (OS): MacOS SIlicon Tahoe 26.6.2, Ubuntu 24.04