Make install instructions consistent

In the comments in google_admanager.module on line 110, the module says
This function should be called from pianofiles_preprocess_page(&$vars) as followed
But the README.txt that comes with the module says to use...
function _phptemplate_variables($hook, $vars)

The module should say "phptemplate_preprocess" instead of "pianofiles_preprocess". Suggested revision for README.txt follows:

4. Add the following code into your theme's template.php file. (If phptemplate_preprocess_page(&$vars) already exists, copy the four lines starting with "// Insert Google..." into the function.)

function phptemplate_preprocess_page(&$vars) {

  // Insert Google Ad Manager scripts into header 
  if (module_exists('google_admanager')) {
    $vars['scripts'] .= google_admanager_add_js();
  }

}