Update git submodules

* Update helpcontent2 from branch 'libreoffice-6-2'
  - tdf#117890 Remove unhelpful screenshots (1/2)
    
    Change-Id: I8a96220ae688f78fe43d66ab205323f3d4605140
    Reviewed-on: https://gerrit.libreoffice.org/68392
    Tested-by: Jenkins
Reviewed-by: Olivier Hallot <olivier.hallot@libreoffice.org>
    (cherry picked from commit c74a4653f50aedfd99ee83a1a841ad5b7886b9be)
    Reviewed-on: https://gerrit.libreoffice.org/68480Reviewed-by: Adolfo Jayme Barrientos <fitojb@ubuntu.com>
Tested-by: Adolfo Jayme Barrientos <fitojb@ubuntu.com>
    

helpcontent2 @ 06e3b4dc

-Subproject commit 7f8f2aefb437aa6c08c597cb2ea99cd1b67696e9
+Subproject commit 06e3b4dcb878f735bca347d3a19ad011e45330f0