[gnome-user-docs] look-background: remove duplicate word

[Petr Kovář <pmkovar src gnome org>]

commit 17f7405656767b7d6b4acfcbd5e4c3aff442f58d
Author: Anders Jonsson <anders jonsson norsjovallen se>
Date:   Fri Oct 6 01:46:14 2017 +0200

    look-background: remove duplicate word
    
    https://bugzilla.gnome.org/show_bug.cgi?id=788141

 gnome-help/C/look-background.page |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/gnome-help/C/look-background.page b/gnome-help/C/look-background.page
index 94d6659..776686c 100644
--- a/gnome-help/C/look-background.page
+++ b/gnome-help/C/look-background.page
@@ -51,7 +51,7 @@
 
   <title>Change the desktop and lock screen backgrounds</title>
 
-  <p>You can change the image used for your backgrounds or set it to a be a
+  <p>You can change the image used for your backgrounds or set it to be a
   solid color.</p>
 
   <steps>