Merge pull request #256 from schoettl/doc

Add hint in doc for "not fully implemented" feature

Author: jceb

doc/orgguide.txt

@@ -716,6 +716,7 @@ Priorities~
 
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 Breaking tasks down into subtasks~
+  Not fully implemented in vim-orgmode~
 
 It is often advisable to break down large tasks into smaller, manageable
 subtasks. You can do this by creating an outline tree below a TODO item,