[gnome-documents] appdata: Add copyright notice and update license fields

[Debarshi Ray <debarshir src gnome org>]

commit ca164e7901640d95d857a66a60536f3f47fa2287
Author: Pranav Kant <pranav913 gmail com>
Date:   Mon Jun 16 17:52:00 2014 +0530

    appdata: Add copyright notice and update license fields
    
    See:
    http://blogs.gnome.org/hughsie/2014/05/02/appdata-meet-spdx-spdx-meet-appdata/
    
    https://bugzilla.gnome.org/show_bug.cgi?id=731719

 data/org.gnome.Documents.appdata.xml.in |    4 +++-
 1 files changed, 3 insertions(+), 1 deletions(-)
---
diff --git a/data/org.gnome.Documents.appdata.xml.in b/data/org.gnome.Documents.appdata.xml.in
index 663c4d2..18f9c56 100644
--- a/data/org.gnome.Documents.appdata.xml.in
+++ b/data/org.gnome.Documents.appdata.xml.in
@@ -1,7 +1,9 @@
 <?xml version="1.0" encoding="UTF-8"?>
+<!-- Copyright 2013 Red Hat, Inc. -->
 <application>
   <id type="desktop">org.gnome.Documents.desktop</id>
-  <licence>CC0</licence>
+  <metadata_license>CC0-1.0</metadata_license>
+  <project_license>GPL-2.0+</project_license>
   <_name>Documents</_name>
   <_summary>A document manager application for GNOME</_summary>
   <description>