ECorrected a misspelling in \S 3.10, (vi ("Bogomlov" ---> "Bogomolov")

ESlightly reworded the discussion following \S 3.11, (iv), (3^{and}) ("numerous miaunderstandings" 
@---> "certain ... misunderstandings")

EAdded Example 3.11.3 (and slightly modified the text immediately preceding Example 3.11.3)