Update git submodules

* Update helpcontent2 from branch 'master'
  - Fix some mistakes in attibutes
    
    Change-Id: Ib5719ff52025c2eb558fb6e31ed69f8a6e733b40
    Reviewed-on: https://gerrit.libreoffice.org/66243
    Tested-by: Jenkins
Reviewed-by: Olivier Hallot <olivier.hallot@libreoffice.org>
    

helpcontent2 @ 4c805e7b

-Subproject commit 9edd5ad5fc08b4173a08e697d1b1a2d2d64227eb
+Subproject commit 4c805e7b0cf85aaff832353fe5fb5efcc6d6cfe0