Fix minor typos

Author: AaronO

lib/retro.js

@@ -46,8 +46,7 @@ function retroSection(section) {
     var exercise = section2obj(section);
 
     // Convert to new format
-    var blockCode = newNode(exercise);
-
+    var blockCode = exerciseBlock(exercise);
 
     return [
         // Use a html node so it's
@@ -78,7 +77,7 @@ function retro(content) {
     });
 
     // Bring sections back together into a list of lexed nodes
-    var newLexed = sections.join(newSections)
+    var newLexed = sections.join(newSections);
 
     // Render back to markdown
     return render(newLexed);