Update git submodules

* Update helpcontent2 from branch 'master'
  - Avoid several JS errors.
    
    Change-Id: If0b8b4f3e8c3464f4e7f812ba727a929330438f3
    Reviewed-on: https://gerrit.libreoffice.org/58864
    Tested-by: Jenkins
Reviewed-by: Olivier Hallot <olivier.hallot@libreoffice.org>
    

helpcontent2 @ 9e466004

-Subproject commit 7ab3eded419b6fddbdd9d7a7c1f676b3720950c0
+Subproject commit 9e4660049b5f4c6da3c652f068186e52a360ae3b