[gnome-mines] Fix typo (chosing) in documentation

[Ekaterina Gerasimova <kat src gnome org>]

commit cb927989aa221dac841501723df5411ca14fdb76
Author: Anders Jonsson <anders jonsson norsjovallen se>
Date:   Thu Apr 2 17:38:40 2015 +0200

    Fix typo (chosing) in documentation

 help/C/rules.page |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/help/C/rules.page b/help/C/rules.page
index 9f11f13..0e31885 100644
--- a/help/C/rules.page
+++ b/help/C/rules.page
@@ -28,7 +28,7 @@
 
   <steps>
     <item>
-      <p>Start by chosing one of the three default board sizes, or by
+      <p>Start by choosing one of the three default board sizes, or by
       selecting a custom board.</p>
     </item>
     <item>