[geary] Update preferences with descriptions of new options

[Adam Dingle <adamd src gnome org>]

commit 15b1632d176e4d7448a9c663d81fea8d0783fca6
Author: Robert Schroll <rschroll gmail com>
Date:   Wed May 27 13:36:52 2015 -0400

    Update preferences with descriptions of new options
    
    Namely, the "Use three pan view" and "Always watch for new mail"
    options.  Also update the text about notifications to reflect changes to
    GNOME Shell.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=749925

 help/C/preferences.page |   16 ++++++++++++++--
 1 files changed, 14 insertions(+), 2 deletions(-)
---
diff --git a/help/C/preferences.page b/help/C/preferences.page
index df48892..7701e3b 100644
--- a/help/C/preferences.page
+++ b/help/C/preferences.page
@@ -27,6 +27,12 @@
        <p>Enables message previews in the conversation list. Previews show
        the first few lines of each message. </p>
        </item>
+       <item>
+       <title><gui>Use three pane view</gui></title>
+       <p>Show the folder list, the conversation list, and the messages side-by-side-by-side in three
+       panes.  If not selected, the folder list and conversation list will be stacked vertically in a
+       single pane.</p>
+       </item>
        </terms>
        </section>
        
@@ -52,8 +58,14 @@
        <title><gui>Show notifications for new mail</gui></title>
        <p>When set, Geary displays a <em>notification</em> each time a new message arrives.  Notifications
        are displayed in a system-dependent manner.  On GNOME Shell, notifications appear at the
-       bottom of the display.  In Ubuntu Unity, notifications appear at the upper right
-       of the display.</p>
+       bottom of the display (older versions) or centered just below the top bar (newer versions).
+       In Ubuntu Unity, notifications appear at the upper right of the display.</p>
+       </item>
+       <item>
+       <title><gui>Always watch for new mail</gui></title>
+       <p>Geary will watch your accounts for new mail even when the main window is not open.  To do
+       this, it will silently start when you log in to your computer, and it will continue to run
+       after you close the main window.</p>
        </item>
        </terms>
        </section>