[gimp-help] Small typo fixed

[Marco Ciampa <marcoc src gnome org>]

commit 118be48035de879545d37548ab1d0eb4fa2f8887
Author: Marco Ciampa <ciampix posteo net>
Date:   Thu Jan 17 01:06:32 2019 +0100

    Small typo fixed

 src/appendix/tone-mapping-tutorial.xml | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/src/appendix/tone-mapping-tutorial.xml b/src/appendix/tone-mapping-tutorial.xml
index bc92720c5..bb33ed659 100644
--- a/src/appendix/tone-mapping-tutorial.xml
+++ b/src/appendix/tone-mapping-tutorial.xml
@@ -700,7 +700,7 @@ are also unbounded</ulink>.
       Photographs taken in bright direct sunlight typically are of high 
       dynamic range scenes, and the resulting camera file usually requires 
       careful tone mapping to produce a satisfactory final image. High bit 
-      depth GIMP’s floating point floating point “Colors/Exposure” provides a 
+      depth GIMP’s floating point “Colors/Exposure” provides a 
       very useful tool for dealing with this type of image, and of course is 
       equally useful for any image where the goal is to raise the shadows and 
       midtones without blowing out the highlights.