API Doc error

@gisle I just used this great module on a project. I found it very useful and well done. Thanks for your work.

api.php document is incorrect given the following in .module file

      drupal_alter('freelink', $link, $data);

It's plain to see only two parameters are passed to hook_freelink_alter(). However the api.php signature does not match.
Same is true for hook_freelinking_alter().

See patch for fix.

Please provide credit on any commit.