Apply suggestions from code review

Author: kentcdodds

src/role-helpers.js

@@ -154,7 +154,7 @@ function getRoles(container, {hidden = false} = {}) {
 
 function prettyRoles(dom, {hidden}) {
   const roles = getRoles(dom, {hidden})
-  //We prefer to skip generic role, we don't recommend it
+  // We prefer to skip generic role, we don't recommend it
   return Object.entries(roles)
     .filter(([role]) => role !== 'generic')
     .map(([role, elements]) => {