debian: fix paths of examples

Change-Id: I054e500be9527b1dd0fc0c21cde2b7b2d2fdfbff
diff --git a/debian/osmo-gbproxy.install b/debian/osmo-gbproxy.install
index 62ebe2a..33ec570 100644
--- a/debian/osmo-gbproxy.install
+++ b/debian/osmo-gbproxy.install
@@ -1,2 +1,2 @@
 usr/bin/osmo-gbproxy
-usr/share/doc/openbsc/examples/osmo-gbproxy
+usr/share/doc/osmo-sgsn/examples/osmo-gbproxy