Fixed another brush typo.md

Fixed it from saying "Set Base Size to 3" to saying "Set Brush Size to 3"

Author: BizkitKing

content/en-us/tutorials/curriculums/core/building/create-an-environment-with-terrain.md

@@ -161,7 +161,7 @@ To apply materials to the island:
    </video>
 
 1. Navigate back to the **Terrain Editor** window, then in the **Brush Settings** and **Material Settings** sections,
-   1. Set **Base Size** to **3**.
+   1. Set **Brush Size** to **3**.
    1. Set **Material** to **Grass**.
 1. In the viewport, drag along the edges of the island to apply blades of grass, leaving space in the middle of the island for
    the spawn location and the initial platforms.