Updated core

Project: help  e828dbadef246a13c1ba4b6c3f26064bad602a67

Help page for Notebook bar

Add help page for notebook bar.
Based on the work of Szymon Klos eszkadev@gmail.com

Added a warning text on the fact it is an experimental feature

Now we get the warning

Change-Id: Icf014a7c03469c5bf484ed3c449bb34cd23b0485
Reviewed-on: https://gerrit.libreoffice.org/29043Reviewed-by: Olivier Hallot <ohallot@collabora.co.uk>
Tested-by: Olivier Hallot <ohallot@collabora.co.uk>

helpcontent2 @ e828dbad

-Subproject commit 708e33c4cb0054b38fced2fb160a5240e02feb01
+Subproject commit e828dbadef246a13c1ba4b6c3f26064bad602a67