Adding a 'search tips' link next to the search button in a views-based search
You need to:


Find the specific view exposed form by using the #id array key.
Find for the search button array key. 
Use the #suffix form key to append your link.


A helpful tool to look into the array structure is by using the dsm() function from Devel module.

Additional information for best practice is that use the l() function to structure your link.

So it would look something like:

if ($form['#id'] == 'views-exposed-form-test-page') {
  $form['submit']['#suffix'] = l(t('Search tips'), 'link-to-basic-page');
}