Update git submodules

* Update helpcontent2 from branch 'master'
  - Help files: http -> https
    
    + some more conservative changes
    
    Change-Id: I1ee93a61399224c1903ed01c9ad6af9aa252d2a0
    Reviewed-on: https://gerrit.libreoffice.org/63210
    Tested-by: Jenkins
Reviewed-by: Olivier Hallot <olivier.hallot@libreoffice.org>
    

helpcontent2 @ b10326be

-Subproject commit a0a0c66fd33aa7a8c441b58d52e49a018ca83d8c
+Subproject commit b10326be4169e4aafc56f9b46b62d0507fa7d535