[gnome-sudoku] Fix typo

[Balázs Úr <urbalazs src gnome org>]

commit 08e95a9517e2d631964f177e67d8a6d7e3fcbddf
Author: Balázs Úr <balazs urbalazs hu>
Date:   Sat Mar 9 23:54:25 2019 +0100

    Fix typo

 help/C/highlighting.page | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/help/C/highlighting.page b/help/C/highlighting.page
index 8d4a6bf..97a0ba4 100644
--- a/help/C/highlighting.page
+++ b/help/C/highlighting.page
@@ -21,6 +21,6 @@
 
 <title>Highlighting</title>
 
-<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>
+<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 then select <gui 
style="menuitem">Highlighter</gui>.</p>
 
 </page>