Update git submodules

* Update helpcontent2 from branch 'master'
  - tdf#117551 Change icons to SVG equivalent
    
    Change-Id: I5d174b434429485d270ba7b6e9147a3bc2b84828
    Reviewed-on: https://gerrit.libreoffice.org/60056
    Tested-by: Jenkins
Reviewed-by: Olivier Hallot <olivier.hallot@libreoffice.org>
    

helpcontent2 @ 39da00d7

-Subproject commit 0d03a98c88e64fb3303ecc80879e76f327d6bf4f
+Subproject commit 39da00d7b4006f8bffe2075ac7c58afbdbc81785