Update git submodules

* Update helpcontent2 from branch 'master'
  to 9db68c8ce0b3f2ed588345a5d3fb33c4af545bb7
  - Correct INDEX() syntax and adapt to reality, clarify semantics
    
    Row and Column arguments are not only optional but can also be
    omitted / given as empty argument.
    
    Reword the multiple ranges explanation.
    
    Remove a decade old source comment.
    
    Change-Id: Ie34e4731b88d4b3adc4a6d0cc98c9e4a02b3c669
    Reviewed-on: https://gerrit.libreoffice.org/c/help/+/144846
    Reviewed-by: Eike Rathke <erack@redhat.com>
    Tested-by: Jenkins
    
diff --git a/helpcontent2 b/helpcontent2
index 70c4643..9db68c8 160000
--- a/helpcontent2
+++ b/helpcontent2
@@ -1 +1 @@
Subproject commit 70c46432b1cb4e994de45ca8a1f6bda6e286b1a9
Subproject commit 9db68c8ce0b3f2ed588345a5d3fb33c4af545bb7