Docs: Improve inline comments per the documentation standards.

Includes minor code layout fixes for better readability.

See #48303.

git-svn-id: https://develop.svn.wordpress.org/trunk@47122 602fd350-edb4-49c9-b593-d223f7449a82

src/wp-admin/plugin-install.php

@@ -5,7 +5,7 @@
  * @package WordPress
  * @subpackage Administration
  */
-// TODO route this pages via a specific iframe handler instead of the do_action below
+// TODO: Route this page via a specific iframe handler instead of the do_action below.
 if ( ! defined( 'IFRAME_REQUEST' ) && isset( $_GET['tab'] ) && ( 'plugin-information' == $_GET['tab'] ) ) {
 	define( 'IFRAME_REQUEST', true );
 }