Update git submodules

* Update helpcontent2 from branch 'master'
  - tdf#53524 (compl) Minor tweaks in Help page.
    
    Added ref to icons
    minor updates on tags
    
    Change-Id: Ia9812a5928554284a5a2fb5416983888e2437439
    Reviewed-on: https://gerrit.libreoffice.org/68915
    Tested-by: Jenkins
Reviewed-by: Olivier Hallot <olivier.hallot@libreoffice.org>
    

helpcontent2 @ 3013fcc8

-Subproject commit 8b9d37bf1bb9bfc21343cbd02f21201c56cf05ca
+Subproject commit 3013fcc8dd2ca6407c6bf17a36a34741d0c9c968