Update git submodules

* Update helpcontent2 from branch 'master'
  - Help files: http -> https
    
    + some more conservative changes
    
    Change-Id: I328505b05838c3f3ce40759096ca77d30c874c57
    Reviewed-on: https://gerrit.libreoffice.org/63196
    Tested-by: Jenkins
Reviewed-by: Sophie Gautier <gautier.sophie@gmail.com>
Reviewed-by: Olivier Hallot <olivier.hallot@libreoffice.org>
    

helpcontent2 @ b0269e63

-Subproject commit 9077e33a902ac32266b88516c91e4fc04fd23419
+Subproject commit b0269e6331ef725f4cea02fc606c5d30b011b3bd