Docs: Document $error, $interim_login, and $action globals in login_header() and login_footer().

Props priyankabehera155, faisal03, mukesh27, SergeyBiryukov.
Fixes #45777.
Built from https://develop.svn.wordpress.org/trunk@46620


git-svn-id: http://core.svn.wordpress.org/trunk@46417 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/version.php

@@ -13,7 +13,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '5.4-alpha-46616';
+$wp_version = '5.4-alpha-46620';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.

wp-login.php

@@ -27,6 +27,12 @@ if ( force_ssl_admin() && ! is_ssl() ) {
  *
  * @since 2.1.0
  *
+ * @global string      $error         Login error message set by deprecated pluggable wp_login() function
+ *                                    or plugins replacing it.
+ * @global bool|string $interim_login Whether interim login modal is being displayed. String 'success'
+ *                                    upon successful login.
+ * @global string      $action        The action that brought the visitor to the login page.
+ *
  * @param string   $title    Optional. WordPress login Page title to display in the `<title>` element.
  *                           Default 'Log In'.
  * @param string   $message  Optional. Message to display in header. Default empty.
@@ -269,6 +275,9 @@ function login_header( $title = 'Log In', $message = '', $wp_error = null ) {
  *
  * @since 3.1.0
  *
+ * @global bool|string $interim_login Whether interim login modal is being displayed. String 'success'
+ *                                    upon successful login.
+ *
  * @param string $input_id Which input to auto-focus.
  */
 function login_footer( $input_id = '' ) {