Update defining-a-component.md
Update defining-a-component.md

Added a bit of clarity with respect to path names vs file names
misfo/guides,gpluta/guides,skaterdav85/guides,gregzx/guides,SaladFork/emberjs-guides,benjaminokeefe/guides,constantm/guides,xymbol/guides,gpluta/guides,misfo/guides,constantm/guides,SaladFork/emberjs-guides,gpluta/guides,vikram7/guides,boztek/guides,ubuntuvim/guides,anthias/guides,knownasilya/guides,HeroicEric/guides,xymbol/guides,kevinkucharczyk/guides,benjaminokeefe/guides,nicobot/guides,thriqon/guides,greyhwndz/guides,thriqon/guides,mikzar/guides,xymbol/guides,RalfWeinand/guides,bmac/guides,constantm/guides,Joelkang/guides,szines/guides,davidpett/guides,alexspeller/guides,skaterdav85/guides,dgeb/guides,MarkMT/guides,grapho/guides,richardkalehoff/guides,bmac/guides,grapho/guides,vikram7/guides,nicobot/guides,knownasilya/guides,mikzar/guides,boztek/guides,jjhampton/guides,richardkalehoff/guides,jkarsrud/guides,alexspeller/guides,richardkalehoff/guides,jjhampton/guides,benoittgt/guides,RalfWeinand/guides,Kuzirashi/guides,kevinkucharczyk/guides,jkarsrud/guides,Joelkang/guides,ubuntuvim/guides,tleskin/guides,szines/guides,jackfranklin/guides,vikram7/guides,dgeb/guides,MarkMT/guides,HeroicEric/guides,gregzx/guides,knownasilya/guides,bmac/guides,benjaminokeefe/guides,papilip/emberjs-guides-french,greyhwndz/guides,boztek/guides,anthias/guides,benoittgt/guides,thriqon/guides,anthias/guides,HeroicEric/guides,tleskin/guides,jjhampton/guides,MarkMT/guides,davidpett/guides,davidpett/guides,dgeb/guides,skaterdav85/guides,szines/guides,papilip/emberjs-guides-french,Kuzirashi/guides,papilip/emberjs-guides-french,gregzx/guides,misfo/guides,knownasilya/guides,nicobot/guides,davidpett/guides,kevinkucharczyk/guides,bmac/guides,MarkMT/guides,mikzar/guides,jackfranklin/guides,ubuntuvim/guides,greyhwndz/guides,jkarsrud/guides,Kuzirashi/guides,jkarsrud/guides,skaterdav85/guides,tleskin/guides,grapho/guides,benoittgt/guides,ubuntuvim/guides,RalfWeinand/guides,SaladFork/emberjs-guides,alexspeller/guides,Joelkang/guides,jackfranklin/guides