se-edu / addressbook-level4 / 4406

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Pull #861

travis-ci

DeveloperGuide: update sections on UndoRedoStack

UndoRedoStack previously stores the UndoableCommands, and was
previously in LogicManager.

Since UndoRedoStack has been updated to store ReadOnlyAddressBook and
has been moved to Model instead, the sections on undo/redo feature and
Logic and Model component in DeveloperGuide is out of date.

Let's update the undo/redo feature section in DeveloperGuide to follow
the updated UndoRedoStack storing of AddressBook states, and the Logic
and Model component class diagrams involving UndoRedoStack.

UndoableCommand has also been removed from the codebase.

Let's also remove the `Structure of Commands in the Logic Component`
section under Logic component in DeveloperGuide.

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