Update git submodules

* Update helpcontent2 from branch 'master'
  - Related: tdf#121173 double spaces
    
    Change-Id: Iecc58ab0812c3a1bd279e28b8d0bf2de99a24792
    Reviewed-on: https://gerrit.libreoffice.org/64887
    Tested-by: Jenkins
Reviewed-by: Sophie Gautier <gautier.sophie@gmail.com>
Reviewed-by: Adolfo Jayme Barrientos <fitojb@ubuntu.com>
    

helpcontent2 @ 793e75c7

-Subproject commit 79b0e57e1cbc1b9a3c56f6fd60369b26fef92879
+Subproject commit 793e75c7f7d321491e2eecfb88ed05f0661ffaf9