Update git submodules

* Update helpcontent2 from branch 'master'
  - Removed executable permission on SVG file
    
    Change-Id: I9c0160c1bab14a7387d5254676715385c3de3e3c
    Reviewed-on: https://gerrit.libreoffice.org/66717
    Tested-by: Jenkins
Reviewed-by: Julien Nabet <serval2412@yahoo.fr>
    

helpcontent2 @ 1a0b264b

-Subproject commit 5b3cb872ff21a18460b76da364cf4f9130b8f285
+Subproject commit 1a0b264b2b23905acb24f86d5932bfe5ac7bd078