Accessibility: Update since annotation for wp_link_pages().

Updates the since annotation for the `aria_current` argument introduced in #42440.

Fixes #41859.

Built from https://develop.svn.wordpress.org/trunk@44411


git-svn-id: http://core.svn.wordpress.org/trunk@44241 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/post-template.php

@@ -871,7 +871,7 @@ function post_password_required( $post = null ) {
  * Quicktag one or more times). This tag must be within The Loop.
  *
  * @since 1.2.0
- * @since 5.0.0 Added the `aria_current` argument.
+ * @since 5.1.0 Added the `aria_current` argument.
  *
  * @global int $page
  * @global int $numpages

wp-includes/version.php

@@ -13,7 +13,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '5.1-alpha-44410';
+$wp_version = '5.1-alpha-44411';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.