[geary] Update start-notification preferences text, tooltip, and user manual.

[Michael Gratton <mjog src gnome org>]

commit 8b42ceda1aec209f0b898b0e680cdcab80266e28
Author: Michael James Gratton <mike vee net>
Date:   Thu Jan 11 02:14:34 2018 +1100

    Update start-notification preferences text, tooltip, and user manual.
    
    Fixes Bug 742244, again.

 help/C/preferences.page  |    6 +++---
 ui/preferences-dialog.ui |    4 ++--
 2 files changed, 5 insertions(+), 5 deletions(-)
---
diff --git a/help/C/preferences.page b/help/C/preferences.page
index 1dd36af..db050e3 100644
--- a/help/C/preferences.page
+++ b/help/C/preferences.page
@@ -62,12 +62,12 @@
        In Ubuntu Unity, notifications appear at the upper right of the display.</p>
        </item>
        <item>
-       <title><gui>Always watch for new mail</gui></title>
+       <title><gui>Watch for new mail when closed</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>
+       after you close all windows.</p>
        </item>
        </terms>
        </section>
-       
+
 </page>
diff --git a/ui/preferences-dialog.ui b/ui/preferences-dialog.ui
index 4488e39..6a532d8 100644
--- a/ui/preferences-dialog.ui
+++ b/ui/preferences-dialog.ui
@@ -161,11 +161,11 @@
             </child>
             <child>
               <object class="GtkCheckButton" id="startup_notifications">
-                <property name="label" translatable="yes">Always _watch for new mail</property>
+                <property name="label" translatable="yes">_Watch for new mail when closed</property>
                 <property name="visible">True</property>
                 <property name="can_focus">True</property>
                 <property name="receives_default">False</property>
-                <property name="tooltip_text" translatable="yes">Geary will run in the background and notify 
of new mail</property>
+                <property name="tooltip_text" translatable="yes">Geary will keep running after all windows 
are closed</property>
                 <property name="margin_start">12</property>
                 <property name="margin_end">5</property>
                 <property name="margin_top">5</property>