Fix typo

app-spec.md

@@ -89,7 +89,7 @@ New todos are entered in the input at the top of the app. The input element shou
 
 ### Mark all as complete
 
-This checkbox toggles all the todos to the same state as itself. Make sure to clear the checked state after the the "Clear completed" button is clicked. The "Mark all as complete" checkbox should also be updated when single todo items are checked/unchecked. Eg. When all the todos are checked it should also get checked.
+This checkbox toggles all the todos to the same state as itself. Make sure to clear the checked state after the "Clear completed" button is clicked. The "Mark all as complete" checkbox should also be updated when single todo items are checked/unchecked. Eg. When all the todos are checked it should also get checked.
 
 ### Item
 

contributing.md

@@ -15,7 +15,7 @@ existing problems.
 It doesn't matter whether your app is written in plain JavaScript and HTML or is cross-compiled to
 something a modern browser can execute. We care about bold ideas
 that bring something truly new to the table, but minor variations of existing
-frameworks or languages only add to [Frontend Choice
+frameworks or languages only add to [Front-end Choice
 Paralysis](http://addyosmani.com/blog/front-end-choice-paralysis/).
 
 Please bear in mind that your project should have reached a certain level of