Update git submodules

* Update helpcontent2 from branch 'libreoffice-6-2'
  - Moved the pagination controls to the top
    
    As the height of the result list keeps changing constantly,
    it was highly annoying to click the arrows in the controls.
    
    Change-Id: I82308adc3971f25ed629009bf1e0854d38197560
    Reviewed-on: https://gerrit.libreoffice.org/66795
    Tested-by: Jenkins
Reviewed-by: Olivier Hallot <olivier.hallot@libreoffice.org>
    (cherry picked from commit b3686d53d10873b1260091a4c6a898575516217e)
    Reviewed-on: https://gerrit.libreoffice.org/68522Reviewed-by: Adolfo Jayme Barrientos <fitojb@ubuntu.com>
    

helpcontent2 @ aa7a881b

-Subproject commit e5e19bf05d9f59e61c19b1d40aacedc643f6d6f1
+Subproject commit aa7a881b0cddfab63d3fdfe3904f8a70200b8ad7