fixed syntax issues + added clarification after teaching course.
fixed syntax issues + added clarification after teaching course.

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