Update git submodules

* Update helpcontent2 from branch 'master'
  - Compiler error due to incorrect indentation 
    
    Change-Id: I041f9ac5d160ef2ebb23e77ce3d35f02e3b703e4
    Reviewed-on: https://gerrit.libreoffice.org/69053
    Tested-by: Jenkins
Reviewed-by: Olivier Hallot <olivier.hallot@libreoffice.org>
    

helpcontent2 @ 669ede53

-Subproject commit 496aaf8cbcd030c1ddfbc3776c23edd08307b96e
+Subproject commit 669ede5358fc7aa63420bd61b62548f2d0b54519