I18N: Add @global entry for $wp_locale in wp_maybe_decline_date().

Props Dency.
Fixes #41046.

git-svn-id: https://develop.svn.wordpress.org/trunk@40911 602fd350-edb4-49c9-b593-d223f7449a82

src/wp-includes/functions.php

@@ -158,6 +158,8 @@ function date_i18n( $dateformatstring, $unixtimestamp = false, $gmt = false ) {
  *
  * @since 4.4.0
  *
+ * @global WP_Locale $wp_locale
+ *
  * @param string $date Formatted date string.
  * @return string The date, declined if locale specifies it.
  */