Fix links to fetch spec
Fix links to fetch spec

Fixes links to fetch spec and a typo.
nlfurniss/ember-fetch,calvinmetcalf/ember-fetch,stefanpenner/ember-fetch,nlfurniss/ember-fetch,calvinmetcalf/ember-fetch,calvinmetcalf/ember-fetch,nlfurniss/ember-fetch,nlfurniss/ember-fetch,stefanpenner/ember-fetch,stefanpenner/ember-fetch