[gnome-sudoku] help: Remove confusing figure which definitely does not only show highlighting

[Andre Klapper <aklapper src gnome org>]

commit e87dffbb515517d5b4b2c44a42e38ebab8c520ca
Author: Andre Klapper <a9016009 gmx de>
Date:   Sun Mar 3 12:45:34 2019 +0100

    help: Remove confusing figure which definitely does not only show highlighting

 help/C/highlighting.page | 6 ------
 1 file changed, 6 deletions(-)
---
diff --git a/help/C/highlighting.page b/help/C/highlighting.page
index 1d1b2b2..8d4a6bf 100644
--- a/help/C/highlighting.page
+++ b/help/C/highlighting.page
@@ -23,10 +23,4 @@
 
 <p>You can turn on highlighting to automatically highlight the current row, column and box in different 
colors. This can make it easier to see which values cannot go into a current square. To toggle highlighting, 
Press the menu button in the top-right corner of the window and and then select <gui 
style="menuitem">Highlighter</gui>.</p>
 
-<figure>
-  <desc><app>Sudoku</app> with highlighting.</desc>
-  <media type="image" mime="image/png" src="figures/rowcolumnbox.png" width="400" its:translate="no" 
> </media>
-</figure>
-
-
 </page>