[gnome-software/gnome-3-22] Added missing comment for the GsApp:description property

[Kalev Lember <klember src gnome org>]

commit 50615c3132162e887a8448c4bf070cd93ee74aad
Author: Mario Sanchez Prada <mario endlessm com>
Date:   Thu Oct 6 13:29:00 2016 +0100

    Added missing comment for the GsApp:description property
    
    (cherry picked from commit ff7ee0671990a048723ffd6467b3fb8623deedf7)

 src/gs-app.c |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)
---
diff --git a/src/gs-app.c b/src/gs-app.c
index 218c986..4c0491b 100644
--- a/src/gs-app.c
+++ b/src/gs-app.c
@@ -3444,6 +3444,9 @@ gs_app_class_init (GsAppClass *klass)
                                     G_PARAM_READWRITE | G_PARAM_CONSTRUCT);
        g_object_class_install_property (object_class, PROP_SUMMARY, pspec);
 
+       /**
+        * GsApp:description:
+        */
        pspec = g_param_spec_string ("description", NULL, NULL,
                                     NULL,
                                     G_PARAM_READWRITE | G_PARAM_CONSTRUCT);