There is no such user documentation that could be provided to your end users. You can, however, post an item in Kendo UserVoice
to propose such resource to be created.
On a side note, an end-user manual is available for Editor UI for ASP.NET AJAX, if you consider creating one on your own (for Kendo Editor), you could possibly reuse some content from there. You can download it from here (http://www.telerik.com/documents/RadEditorAjaxEndUserManual.pdf
Also, in RadEditor there is a help dialog (http://demos.telerik.com/aspnet-ajax/editor/examples/built-in-dialogs/defaultcs.aspx
). You can create such a dialog in Kendo Editor by creating a custom tool
to open a dialog. Note that tools are different in the two editors. Therefore, the content should be different in order prevent possible confusion among the end users.
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