Update git submodules

* Update helpcontent2 from branch 'master'
  to 26a4384689855508e662ae04cb49852280db50ee
  - Proofreading: A document may have “contents”, but not the TOC itself
    
    Change-Id: I5b20b7702a795570832ae88e5fac22d702dccb00
    
diff --git a/helpcontent2 b/helpcontent2
index e21dbdf..26a4384 160000
--- a/helpcontent2
+++ b/helpcontent2
@@ -1 +1 @@
Subproject commit e21dbdfd8585da7953ea5f442c7b7b9839a9be1c
Subproject commit 26a4384689855508e662ae04cb49852280db50ee