[gnome-multi-writer] trivial: Fix comment in the AppData file

[Richard Hughes <rhughes src gnome org>]

commit 3ba933373e7b75da6c80171c1b69e04e04f78163
Author: Richard Hughes <richard hughsie com>
Date:   Sun Feb 22 18:53:55 2015 +0000

    trivial: Fix comment in the AppData file

 data/appdata/org.gnome.MultiWriter.appdata.xml.in |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/data/appdata/org.gnome.MultiWriter.appdata.xml.in 
b/data/appdata/org.gnome.MultiWriter.appdata.xml.in
index 7e42e95..d86e7cb 100644
--- a/data/appdata/org.gnome.MultiWriter.appdata.xml.in
+++ b/data/appdata/org.gnome.MultiWriter.appdata.xml.in
@@ -59,7 +59,7 @@
   </screenshots>
   <!--
    Validate with `appstream-util validate *.appdata.xml`
-   Use `date -d "2010-10-02" "+%s"` to get the timestamp.
+   Use `date -d now +%s` or `date -d 2010-01-32 +%s` to get the timestamp.
   -->
   <releases>
     <release version="3.15.90" timestamp="1285974000">