removed inconsistencies in examples + removed last slide.
removed inconsistencies in examples + removed last slide.

jennifer-mann/gdi-intro-javascript,girldevelopit/gdi-featured-js-intro,Roenok/gdi-intro-javascript,amandagogogo/gdicincy-intro-js,anythingcodes/gdi-featured-js-intro,jennifer-mann/gdi-intro-javascript,girldevelopit/gdi-featured-js-intro,anythingcodes/gdi-featured-js-intro,amandagogogo/gdicincy-intro-js,Roenok/gdi-intro-javascript