Steps to repro:

1. Open Unity;
2. Create new project;
3. Open Lighting Window (Window>Lighting>Settings);
4. Observe the field names in the Lighting window.

Expected result:
Only name of the field is displayed in the field name block. See attached expected.png screenshot.

Actual result:
Some field names (Baked Global Illumination, Directional Mode, Indirect Intensity, Albedo Boost, Lightmap Parameters) also contain text from the tooltips. See attached actual.png screenshot.
Regression introduced in 2018.2.0a1.

Notes:
- Reproducible in 2018.2.0a1;
- Not reproducible in 2018.1.0b1, 2017.3.0p1 , 2017.2.1p1.
- Fields that show tooltips text in the field name also don't have tooltips after hovering cursor.