Update git submodules

* Update helpcontent2 from branch 'master'
  - Fix typo
    
    Change-Id: Ic224fbb099b86942afb651e5c10c6a91d2dac020
    Reviewed-on: https://gerrit.libreoffice.org/63978
    Tested-by: Jenkins
Reviewed-by: Julien Nabet <serval2412@yahoo.fr>
Reviewed-by: Olivier Hallot <olivier.hallot@libreoffice.org>
    

helpcontent2 @ 9634a1ff

-Subproject commit 6c90a05e6cdd65d3656f1a559ff5a1e911741edf
+Subproject commit 9634a1ff3a4ff5c7d4e4c102dd136640e30843dc