Merge pull request google#76 from KestutisIT/patch-1

Typo error fixed

Author: rowan-m

examples/example-captcha.php

@@ -95,7 +95,7 @@
         <p><a href="/">Try again</a></p>
         <?php
     else:
-// If it's not successfull, then one or more error codes will be returned.
+// If it's not successful, then one or more error codes will be returned.
         ?>
         <h2>Something went wrong</h2>
         <p>The following error was returned: <?php