Update git submodules

* Update helpcontent2 from branch 'master'
  to 9839c0b071de018ea00af1ae180756e9e5a52793
  - Revert "Fix typo"
    
    Besides being a wrong fix, please refrain from changing external code locally.
    Go to the upstream project instead, Andrea!
    
    This reverts commit 1e37e14da918a278abe5df8a5885fa211c02ee8b.
    
diff --git a/helpcontent2 b/helpcontent2
index 4b68b8f..9839c0b 160000
--- a/helpcontent2
+++ b/helpcontent2
@@ -1 +1 @@
Subproject commit 4b68b8f837be5932a30a9ff3546afeeaea4f93a5
Subproject commit 9839c0b071de018ea00af1ae180756e9e5a52793