Update git submodules

* Update helpcontent2 from branch 'master'
  to c2b91a5c78e053498f5ff6a411c314e36eb4a859
  - Stick to translatable content and simplify.
    
    * The example was locale dependent and was removed.
    
    Change-Id: I1df47fb5ba18ca4874b8b681ffff88a6fa7514aa
    Reviewed-on: https://gerrit.libreoffice.org/c/help/+/165910
    Tested-by: Jenkins
    Reviewed-by: Olivier Hallot <olivier.hallot@libreoffice.org>
    
diff --git a/helpcontent2 b/helpcontent2
index af2fc2b..c2b91a5 160000
--- a/helpcontent2
+++ b/helpcontent2
@@ -1 +1 @@
Subproject commit af2fc2b7c1d2226ce628f60415fd384ffc75a342
Subproject commit c2b91a5c78e053498f5ff6a411c314e36eb4a859