docs: revise menu guide to focus more on using menu resources
instead of defining menus in code. And revise some style. Change-Id: I0a5a19a51062d72cdb9045c9607cab04b69f554c
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instead of defining menus in code. And revise some style. Change-Id: I0a5a19a51062d72cdb9045c9607cab04b69f554c