Docs: Various improvements and corrections to inline docs.

See #55646


git-svn-id: https://develop.svn.wordpress.org/trunk@54267 602fd350-edb4-49c9-b593-d223f7449a82

src/wp-admin/includes/template.php

@@ -1649,7 +1649,7 @@ function add_settings_section( $id, $title, $callback, $page, $args = array() )
  * @param string   $section  Optional. The slug-name of the section of the settings page
  *                           in which to show the box. Default 'default'.
  * @param array    $args {
- *     Optional. Extra arguments used when outputting the field.
+ *     Optional. Extra arguments that get passed to the callback function.
  *
  *     @type string $label_for When supplied, the setting title will be wrapped
  *                             in a `<label>` element, its `for` attribute populated