uodate reference again to hopefully fix all link issues

diff --git a/src/doc/reference b/src/doc/reference
index 0644ecc4c91065aae808b19883b93893ff8edfb5..219e261ddb833a5683627b0a9be87a0f4486abb9 160000 (submodule)
--- a/src/doc/reference
+++ b/src/doc/reference
@@ -1 +1 @@
-Subproject commit 0644ecc4c91065aae808b19883b93893ff8edfb5
+Subproject commit 219e261ddb833a5683627b0a9be87a0f4486abb9