Update git submodules

* Update helpcontent2 from branch 'master'
  - Help files: http -> https
    
    + some more conservative changes
    
    Change-Id: If73a98d6296081843830f44b75f80657f25a97a9
    Reviewed-on: https://gerrit.libreoffice.org/63216
    Tested-by: Jenkins
Reviewed-by: Caolán McNamara <caolanm@redhat.com>
Tested-by: Caolán McNamara <caolanm@redhat.com>
    

helpcontent2 @ 7edbeb56

-Subproject commit 358e35fb1670578b56501fd1561235028bd0e5b9
+Subproject commit 7edbeb56b088685f4b88c6d4300a3c145c2faf58