[gimp-book-painting] Update parametric-brushes.md

[Americo Gobbo <amerigo src gnome org>]

commit 0559d61b5ad1519d80e777be0c10f4523ee1c8de
Author: Americo Gobbo <jag rabisco gmail com>
Date:   Sat Jun 16 19:14:19 2018 +0000

    Update parametric-brushes.md

 parametric-brushes.md | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/parametric-brushes.md b/parametric-brushes.md
index f2f6044..79d8c14 100644
--- a/parametric-brushes.md
+++ b/parametric-brushes.md
@@ -15,7 +15,7 @@ I thought a simple test … I did a parametric calligraphic brush, very small wi
 From my tests among both brushes, it results that the parametric is better than its equivalent .gbr, if are 
thinking in classic dabs, round, square, diamond and variations of shape forms based in spikes.
 
 <div style="margin:20px;">
-![](parametric-brushes.assets/parametric-brushes-basic-parametric-brushes-editor-brs.png)
+![](./parametric-brushes.assets/parametric-brushes-basic-parametric-brushes-editor-brs.png)
 <div style="font-size:small;">_Brushset and Parametric Editor_</div></div>
 
 The default shapes are round, square and diamond. Is also possible create a great variation of the shapes, 
using the different parameters to control the shape and its aspect (radius, spikes, hardness, aspect ratio, 
angle and spacing).