Where can I edit Admin Panel Page file

Question

I need to edit the "Help" section of the "Page" page in the Admin panel. Since wordpress doesn't allow multiple line breaks I need to make sure the user knows that if they add the "
" tag in the HTML section they will achieve the line break so I figure what better place to add this than the help section. I can't seem to find the Page file though. Directory Help?

Answer 1

You can add the custom help by adding a hook to the page load e.g. page-new.php would become load-page-new.php

function custom_help_page() {
  add_filter('contextual_help','custom_page_help');
}

function custom_page_help($help) {
  $custom =  "<h5>Custom Help</h5>
              <p>Custom help content</p>";
  return $custom.$help; 
}

add_action('load-page-new.php','custom_help_page'); //New page
add_action('load-page.php','custom_help_page'); //Page, edits, updates etc.

If you don't want the default help to still display, simply remove echo $help;

Edited to return rather echo the values.