Add a missing `@since 4.2.0` tag to the DocBlock for `wp_attachment_is()`.

See #25275.

Built from https://develop.svn.wordpress.org/trunk@31660


git-svn-id: http://core.svn.wordpress.org/trunk@31641 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/post.php

@@ -5073,6 +5073,8 @@ function wp_get_attachment_thumb_url( $post_id = 0 ) {
 /**
  * Verifies an attachment is of a given type.
  *
+ * @since 4.2.0
+ *
  * @param string      $type    Attachment type. Accepts 'image', 'audio', or 'video'.
  * @param int|WP_Post $post_id Optional. Attachment ID. Default 0.
  * @return bool True if one of the accepted types, false otherwise.

wp-includes/version.php

@@ -4,7 +4,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '4.2-alpha-31659';
+$wp_version = '4.2-alpha-31660';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.