Update git submodules

* Update helpcontent2 from branch 'master'
  to 3974b8c9cbd0321944d9fe9d9e5109c20d71fe31
  - remove duplicated words
    
    Change-Id: I8c7d06ce3bec5bbd52adfaf8abb661d6ced6204d
    Reviewed-on: https://gerrit.libreoffice.org/c/help/+/86813
    Tested-by: Jenkins
    Reviewed-by: Adolfo Jayme Barrientos <fitojb@ubuntu.com>
    
diff --git a/helpcontent2 b/helpcontent2
index 3646d55..3974b8c 160000
--- a/helpcontent2
+++ b/helpcontent2
@@ -1 +1 @@
Subproject commit 3646d5561856014b0703a318a10d87897d48e626
Subproject commit 3974b8c9cbd0321944d9fe9d9e5109c20d71fe31