Update git submodules

* Update helpcontent2 from branch 'master'
  to 19c16ab2f12ea315fe96951023baab7c66495cbb
  - tdf#138301 - clarification of Data Validity example
    
    Change-Id: I20035ef3fad94c83ce06c8380f8c691cd85c7f83
    Reviewed-on: https://gerrit.libreoffice.org/c/help/+/108714
    Tested-by: Jenkins
    Reviewed-by: Seth Chaiklin <sdc.blanco@youmail.dk>
    
diff --git a/helpcontent2 b/helpcontent2
index 9c96902..19c16ab 160000
--- a/helpcontent2
+++ b/helpcontent2
@@ -1 +1 @@
Subproject commit 9c9690285ccb3e2116626b84f6747f9f71d35b20
Subproject commit 19c16ab2f12ea315fe96951023baab7c66495cbb