Update git submodules

* Update helpcontent2 from branch 'master'
  - Related: tdf#121173 double spaces
    
    Change-Id: I6060aa9759a17cbcb5419586a565688c543cb8f4
    Reviewed-on: https://gerrit.libreoffice.org/64898
    Tested-by: Jenkins
Reviewed-by: Sophie Gautier <gautier.sophie@gmail.com>
Reviewed-by: Olivier Hallot <olivier.hallot@libreoffice.org>
    

helpcontent2 @ 21adf070

-Subproject commit 193f79464c5ab0c4b183bd1d439f1bceedfdca8c
+Subproject commit 21adf07053023db71838ecb833bd50ee700b079c