Docs: Improve documentation for `auth_redirect()`.

Props atachibana.
Fixes #47956.
Built from https://develop.svn.wordpress.org/trunk@45924


git-svn-id: http://core.svn.wordpress.org/trunk@45735 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/pluggable.php

@@ -1005,6 +1005,11 @@ if ( ! function_exists( 'auth_redirect' ) ) :
 	/**
 	 * Checks if a user is logged in, if not it redirects them to the login page.
 	 *
+	 * When this code is called from a page, it checks to see if the user viewing the page is logged in.
+	 * If the user is not logged in, they are redirected to the login page. The user is redirected
+	 * in such a way that, upon logging in, they will be sent directly to the page they were originally
+	 * trying to access.
+	 *
 	 * @since 1.5.0
 	 */
 	function auth_redirect() {

wp-includes/version.php

@@ -13,7 +13,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '5.3-alpha-45923';
+$wp_version = '5.3-alpha-45924';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.