Update git submodules

* Update helpcontent2 from branch 'master'
  - fix menu path to image properties
    
    Change-Id: Ic4ea128ba4d995c6adec288a6b47a19dfd118799
    Reviewed-on: https://gerrit.libreoffice.org/59593
    Tested-by: Jenkins
Reviewed-by: Adolfo Jayme Barrientos <fitojb@ubuntu.com>
    

helpcontent2 @ 648a2877

-Subproject commit e2bf234e63c1ecf7971c2be2e50cfe0c7baa5dcf
+Subproject commit 648a2877770c9434df3099bb3c3b743862a72888