Update git submodules

* Update helpcontent2 from branch 'master'
  - tdf#121065 Replace Other Symbols PNG images with SVG
    
    Replace Other Symbols PNG images with SVG and updated 03091600.xhp and Package_html_media.mk
    
    Change-Id: I31fc96a7aaac023fd63afc45468fa17d3442e6c8
    Reviewed-on: https://gerrit.libreoffice.org/66246
    Tested-by: Jenkins
    Reviewed-by: Olivier Hallot <olivier.hallot@libreoffice.org>
    
diff --git a/helpcontent2 b/helpcontent2
index 17f4dc9..497a508 160000
--- a/helpcontent2
+++ b/helpcontent2
@@ -1 +1 @@
Subproject commit 17f4dc9d60c097e7b71f435cfb1d826b4a29dde8
Subproject commit 497a5081e0ca80d9c29dfd94acd2ebb367676353