Updated Brushes (markdown)

Brushes.md

@@ -34,7 +34,7 @@ local redColor = Brushes.GetColor(255, 255, 0, 0);
 ```
 ---
 ### GetRandomColor
-Returns a psuedo-random color within the RGB spectrum.
+Returns a pseudo-random color within the RGB spectrum.
 #### Syntax:
 ```lua
 color GetRandomColor();