[gnome-user-docs] Fix bug 757437 - add screen rotation description

[Paul Cutler <pcutler src gnome org>]

commit 6a4e69d7da800ea8c2e3a8077d54491d6d8ab1ee
Author: Paul Cutler <paul r cutler gmail com>
Date:   Wed Apr 12 13:50:00 2017 -0500

    Fix bug 757437 - add screen rotation description
    
    Add description of screen rotation button in system menu to fix
    bug 757437

 gnome-help/C/shell-introduction.page |    5 ++++-
 1 files changed, 4 insertions(+), 1 deletions(-)
---
diff --git a/gnome-help/C/shell-introduction.page b/gnome-help/C/shell-introduction.page
index 1e46c25..af3fc97 100644
--- a/gnome-help/C/shell-introduction.page
+++ b/gnome-help/C/shell-introduction.page
@@ -241,7 +241,10 @@ messages will be presented, such as when your battery is critically low.</p>
   <p>When you leave your computer, you can lock your screen to prevent other
   people from using it. You can also quickly switch users without logging out
   completely to give somebody else access to the computer, or you can
-  suspend or power off the computer from the menu.</p>
+  suspend or power off the computer from the menu. If you have a screen 
+  that supports vertical or horizontal rotation, you can quickly rotate the 
+  screen from the system menu. If your screen does not support rotation, 
+  you will not see the button.</p>
 
   <list style="compact">
     <item>