Fix spelling error

index.html

@@ -115,7 +115,7 @@
 
         <h3 id="howcanihelp">How can I help?</h3>
         <p>
-          If you have a compatibile Chromebook, you can fork my Github repo and add new packages to the <code>packages</code> directory if you managed to build them from source successfully on your device. Package recipes are simple Ruby files - here is an example:
+          If you have a compatible Chromebook, you can fork my Github repo and add new packages to the <code>packages</code> directory if you managed to build them from source successfully on your device. Package recipes are simple Ruby files - here is an example:
         </p>
 <pre>
 require 'package'