[quadrapassel] Fix typo (availabe)

[Michael Catanzaro <mcatanzaro src gnome org>]

commit e6b7eaad42cceb9e1610cc807718098669e3dccc
Author: Anders Jonsson <anders jonsson norsjovallen se>
Date:   Fri Mar 20 21:48:02 2015 +0100

    Fix typo (availabe)
    
    https://bugzilla.gnome.org/show_bug.cgi?id=746549

 help/C/preferences.page |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/help/C/preferences.page b/help/C/preferences.page
index 15f8b4c..cd2bec5 100644
--- a/help/C/preferences.page
+++ b/help/C/preferences.page
@@ -24,7 +24,7 @@
 
   <p>To change the game preferences, click the <guiseq><gui>Quadrapassel 
menu</gui><gui>Preferences</gui></guiseq>.</p>
 
-  <p>The three tabs availabe are <gui>Controls</gui>, <gui>Game</gui> and <gui>Theme</gui>.</p>
+  <p>The three tabs available are <gui>Controls</gui>, <gui>Game</gui> and <gui>Theme</gui>.</p>
 
 <section id="controls">
 <title>Controls</title>