Baked lightmaps, documentation and reset button clips when lighting settings window shrinks horizontally.

Steps to Repro:
1. Create a new project
2. Window > rendering
3. Open Lighting settings and dock the window next to inspector
4. Shrink it horizontally

Actual Result:
1. Observe that baked lightmaps, documentation and reset button gets clipped

Expected Result:
1. Anchors for them should be set so they appear after shrinking window

Environment:
Windows and Mac

Occurring with:
2018.3.0a2, 2018.3.0a1

Working with:
2018.2.0b9

Note:
Global Maps and Object maps button is replaced by real-time and baked lightmaps button in 2018.3