Update git submodules

* Update helpcontent2 from branch 'master'
  to 3ffbf68223b981335abdfede5dc5f86c30269c13
  - tdf#154996 Add tabbed UI commands in Help page
    
    + refactoring
    
    Change-Id: I7db22fb77cd690cfadb8b0fda4776ddb0a1ff0df
    Reviewed-on: https://gerrit.libreoffice.org/c/help/+/152373
    Tested-by: Jenkins
    Reviewed-by: Olivier Hallot <olivier.hallot@libreoffice.org>
    
diff --git a/helpcontent2 b/helpcontent2
index 921da60..3ffbf68 160000
--- a/helpcontent2
+++ b/helpcontent2
@@ -1 +1 @@
Subproject commit 921da60c0a7bf06943277d27dad3e10b19d7d5bd
Subproject commit 3ffbf68223b981335abdfede5dc5f86c30269c13