Fixed typos in book.json
Fixed typos in book.json

raazesh-sainudiin/scalable-data-science,lamastex/scalable-data-science,raazesh-sainudiin/scalable-data-science,lamastex/scalable-data-science,raazesh-sainudiin/scalable-data-science,raazesh-sainudiin/scalable-data-science,lamastex/scalable-data-science,lamastex/scalable-data-science,lamastex/scalable-data-science,lamastex/scalable-data-science