The description of the undo/redo menu points is not precise.
The current text is:
Undo: reverses your most recent text-editing action.
Redo: re-applies the editing action that has most recently been reversed by the Undo action.
Undo does not only apply to text editing actions. It should also be stated that the undo/redo functions only work in the editor.
Relates to bug 318