Update lib submodule

diff --git a/doc/test-sw b/doc/test-sw
index c2b8b602ecd71eddac4f96d89a2eafd125aa353f..ff4a6bf50eef01df46ccc0bc6993bc615cfe5e07 160000 (submodule)
--- a/doc/test-sw
+++ b/doc/test-sw
@@ -1 +1 @@
-Subproject commit c2b8b602ecd71eddac4f96d89a2eafd125aa353f
+Subproject commit ff4a6bf50eef01df46ccc0bc6993bc615cfe5e07