Update git submodules

* Update helpcontent2 from branch 'master'
  - Cleanup in /shared/01/02*.xhp files
    
    Change-Id: Id1057af0e0ac1dbbf9cf8d18dfc181416911622b
    Reviewed-on: https://gerrit.libreoffice.org/57116
    Tested-by: Jenkins
    Reviewed-by: Olivier Hallot <olivier.hallot@libreoffice.org>
    
diff --git a/helpcontent2 b/helpcontent2
index 8676e4f..2d421bf 160000
--- a/helpcontent2
+++ b/helpcontent2
@@ -1 +1 @@
Subproject commit 8676e4f3e2562b0723aabcdc78ea12b9ccf2d47e
Subproject commit 2d421bf982a5ed0ae938c78342fed9eae330b8c5