Update git submodules

* Update helpcontent2 from branch 'master'
  - Help files: http -> https
    
    + some more conservative changes
    
    Change-Id: I34de2e567574679ac724655ec0840cce6ed96edb
    Reviewed-on: https://gerrit.libreoffice.org/63212
    Tested-by: Jenkins
Reviewed-by: Sophie Gautier <gautier.sophie@gmail.com>
Reviewed-by: Adolfo Jayme Barrientos <fitojb@ubuntu.com>
    

helpcontent2 @ 37852a43

-Subproject commit 01d79bef0c183c39ef56c4bd8bbdb6ae6e9ff4f8
+Subproject commit 37852a4343f3a9023ac6481947acd401dd9fe55d