fix docs: forgot to use Align in shown figure

Author: thchr

docs/src/index.md

@@ -114,13 +114,12 @@ Align
 ```
 ```@example layouts
 g = smallgraph(:cubical)
-layout = Spring(Ptype=Float32)
-f, ax, p = graphplot(g, layout=layout) # horizontal alignment (zero angle by default)
+f, ax, p = graphplot(g, layout=Align(Spring())) # horizontal alignment (zero angle by default)
 hidedecorations!(ax); hidespines!(ax); ax.aspect = DataAspect(); f #hide
 ```
 
 ```@example layouts
-f, ax, p = graphplot(g, layout=Align(layout, pi/2)) # vertical alignment
+f, ax, p = graphplot(g, layout=Align(Spring(), pi/2)) # vertical alignment
 hidedecorations!(ax); hidespines!(ax); ax.aspect = DataAspect(); f #hide
 ```