Update gradient.jl

Author: sl-solution

src/gradient.jl

@@ -1,5 +1,5 @@
 """
-    gradient(colors...; direction = [0,1,0,0])
+    gradient([colors...]; direction = [0,1,0,0])
 
 A linear gradient interpolates colors along a line, from a starting point to an ending point. By default a linear gradient runs horizontally, from left to right. Use the direction to configure the gradient direction, e.g. [0,0,0,1] runs the gradient vertically. All coordinates are defined in a normalized [0, 1] coordinate space, relative to the bounding box of the item being colored.