Update git submodules

* Update helpcontent2 from branch 'master'
  - Small changes / improvements
    
    Change-Id: Ia4074a79d3bf471cd23e022f6d57057fb5e07e36
    Reviewed-on: https://gerrit.libreoffice.org/66266
    Tested-by: Jenkins
Reviewed-by: Olivier Hallot <olivier.hallot@libreoffice.org>
    

helpcontent2 @ 3ba223f9

-Subproject commit b01d56512f5da9ab4b62095f2c353957e0e8517c
+Subproject commit 3ba223f9a987066c3e3efa1e614443b9fe2fcac6