Update git submodules

* Update helpcontent2 from branch 'master'
  - add back image dimensions
    
    Change-Id: I8e7eaf2010ee31b2191de1bed256ca30c70ac216
    Reviewed-on: https://gerrit.libreoffice.org/72915
    Tested-by: Jenkins
Reviewed-by: Olivier Hallot <olivier.hallot@libreoffice.org>
    

helpcontent2 @ d90be75f

-Subproject commit e7ae111766f390ee4b4d1697893335d33c1a01cc
+Subproject commit d90be75f45fb27041b75c3feed230b01d0ee602c