Update git submodules

* Update helpcontent2 from branch 'master'
  - Removed executable permission on SVG file
    
    Change-Id: I6ff78e12c6d547f18e1808c79d32ef2d6ffa0037
    Reviewed-on: https://gerrit.libreoffice.org/68380
    Tested-by: Jenkins
Reviewed-by: Julien Nabet <serval2412@yahoo.fr>
    

helpcontent2 @ 9b8bbbed

-Subproject commit 7a6c121a39e651f7af4b2f57e33ad0df48166689
+Subproject commit 9b8bbbed8d995c93675100e8b5793ee84c89d2df