Update git submodules

* Update helpcontent2 from branch 'master'
  - StarDesktop object and reorder indexes
    
    Add StarDesktop object description
    Reorder "Other commands" to add UNO objects
    
    Change-Id: Ia6547ea059276f8946b03392d29d968187bcd26c
Signed-off-by: Olivier Hallot <olivier.hallot@libreoffice.org>
    Reviewed-on: https://gerrit.libreoffice.org/64981
    Tested-by: Jenkins
    

helpcontent2 @ 3f0f4525

-Subproject commit a3ad770b3b2ca000646c0b3bfa0933e8486c7a22
+Subproject commit 3f0f452519618e4b0bd0b97a855fc5ffe5514a49