Update git submodules

* Update helpcontent2 from branch 'master'
  - fix description of VBA Rate function
    
    Change-Id: I6cd34d766825d5c947a533368b8ce8d132324fab
    Reviewed-on: https://gerrit.libreoffice.org/58883
    Tested-by: Jenkins
Reviewed-by: Olivier Hallot <olivier.hallot@libreoffice.org>
    

helpcontent2 @ 7aba4422

-Subproject commit af3f6f6d7974bf2ddbf49d2e95e90a3e916af8df
+Subproject commit 7aba4422257bdcc2cf3e54d96c5e329d2b24e5d4