[gssdp] Update documentation copyright

[Jens Georg <jensgeorg src gnome org>]

commit 1acb638632056479bc3fc3cc67e262892823e6b0
Author: Jens Georg <mail jensge org>
Date:   Fri Dec 9 14:49:30 2011 +0100

    Update documentation copyright

 doc/gssdp-docs.sgml |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)
---
diff --git a/doc/gssdp-docs.sgml b/doc/gssdp-docs.sgml
index e9f3bee..c7b2365 100644
--- a/doc/gssdp-docs.sgml
+++ b/doc/gssdp-docs.sgml
@@ -19,6 +19,8 @@
 
     <copyright>
       <year>2009</year>
+      <year>2010</year>
+      <year>2011</year>
       <holder>Nokia Corporation</holder>
     </copyright>