Add missing doc blocks to wp-admin/includes/*.

Fix some egregious uses of tabbing.
Some functions can simply return `apply_filters(...)` instead of setting a variable that is immediately returned.

See #32444.


git-svn-id: https://develop.svn.wordpress.org/trunk@32654 602fd350-edb4-49c9-b593-d223f7449a82

src/wp-admin/update-core.php

@@ -314,7 +314,6 @@ function list_theme_updates() {
 	}
 
 	$form_action = 'update-core.php?action=do-theme-upgrade';
-
 ?>
 <h3><?php _e( 'Themes' ); ?></h3>
 <p><?php _e( 'The following themes have new versions available. Check the ones you want to update and then click &#8220;Update Themes&#8221;.' ); ?></p>
@@ -381,6 +380,8 @@ function list_translation_updates() {
  * @since 2.7.0
  *
  * @global WP_Filesystem_Base $wp_filesystem Subclass
+ *
+ * @param bool $reinstall
  */
 function do_core_upgrade( $reinstall = false ) {
 	global $wp_filesystem;