[dconf] dconf tool docs: mention dbus

[Matthias Clasen <matthiasc src gnome org>]

commit 6005bba98343c6b6df38ff0b65cef668cd3a8e22
Author: Matthias Clasen <mclasen redhat com>
Date:   Tue Jul 16 19:28:28 2013 -0400

    dconf tool docs: mention dbus
    
    It is a common trap to use this tool in a VT without a session
    bus. Mention that a session bus is needed to write changes to
    the database.

 docs/dconf-tool.xml |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)
---
diff --git a/docs/dconf-tool.xml b/docs/dconf-tool.xml
index 456bf27..58258f3 100644
--- a/docs/dconf-tool.xml
+++ b/docs/dconf-tool.xml
@@ -99,6 +99,10 @@
       <replaceable>VALUE</replaceable> arguments must be in GVariant format, so e.g. a string must include
       explicit quotes: "'foo'". This format is also used when printing out values.
     </para>
+
+    <para>
+      Note that dconf needs a D-Bus session bus connection to write changes to the dconf database.
+    </para>
   </refsect1>
 
   <refsect1>