Update git submodules

* Update helpcontent2 from branch 'master'
  - Fix image dimensions expression in style
    
    Change-Id: I1803f18aa0512e5b618daa64efff6487c583fb76
    Reviewed-on: https://gerrit.libreoffice.org/60106
    Tested-by: Jenkins
Reviewed-by: Olivier Hallot <olivier.hallot@libreoffice.org>
    

helpcontent2 @ 0858f6c2

-Subproject commit 49ca3ec3c2290c0ea58a57f31073fc838109f75d
+Subproject commit 0858f6c2d93e701deef99a74567e214f05a9f8e3