Update git submodules

* Update helpcontent2 from branch 'master'
  to ab71a53eb7ba5001cd78781106dbf83f8191a072
  - update help page for Footnote/Endnote numbering
    
      - correct instruction about choosing special character
    
    Change-Id: Ia02993e4ae2a3971251e5a4bc5cf5585b984d5d9
    Reviewed-on: https://gerrit.libreoffice.org/c/help/+/89579
    Tested-by: Jenkins
    Reviewed-by: Seth Chaiklin <sdc.blanco@youmail.dk>
    
diff --git a/helpcontent2 b/helpcontent2
index 3c28b5a..ab71a53 160000
--- a/helpcontent2
+++ b/helpcontent2
@@ -1 +1 @@
Subproject commit 3c28b5afd108e5d2704a79aa5426bd19456cb866
Subproject commit ab71a53eb7ba5001cd78781106dbf83f8191a072