Fix missing spaces in example book
Fix missing spaces in example book

kbknapp/mdBook,azerupi/mdBook,petehayes102/mdBook,azerupi/mdBook,superstring/mdBook,azerupi/mdBook,superstring/mdBook,petehayes102/mdBook,kbknapp/mdBook,kbknapp/mdBook,petehayes102/mdBook,superstring/mdBook,petehayes102/mdBook,kbknapp/mdBook,azerupi/mdBook,superstring/mdBook