Docs: Document the `cookies` default comment field added in [42772].

Props desrosj, chetan200891.
Merges [43304] to the 4.9 branch.
See #44125.
Built from https://develop.svn.wordpress.org/branches/4.9@43306


git-svn-id: http://core.svn.wordpress.org/branches/4.9@43135 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/comment-template.php

@@ -2123,6 +2123,7 @@ function wp_list_comments( $args = array(), $comments = null ) {
  * @since 4.5.0 The 'author', 'email', and 'url' form fields are limited to 245, 100,
  *              and 200 characters, respectively.
  * @since 4.6.0 Introduced the 'action' argument.
+ * @since 4.9.6 Introduced the 'cookies' default comment field.
  *
  * @param array       $args {
  *     Optional. Default arguments and form fields to override.
@@ -2130,9 +2131,10 @@ function wp_list_comments( $args = array(), $comments = null ) {
  *     @type array $fields {
  *         Default comment fields, filterable by default via the {@see 'comment_form_default_fields'} hook.
  *
- *         @type string $author Comment author field HTML.
- *         @type string $email  Comment author email field HTML.
- *         @type string $url    Comment author URL field HTML.
+ *         @type string $author  Comment author field HTML.
+ *         @type string $email   Comment author email field HTML.
+ *         @type string $url     Comment author URL field HTML.
+ *         @type string $cookies Comment cookie opt-in field HTML.
  *     }
  *     @type string $comment_field        The comment textarea field HTML.
  *     @type string $must_log_in          HTML element for a 'must be logged in to comment' message.

wp-includes/version.php

@@ -4,7 +4,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '4.9.7-alpha-43305';
+$wp_version = '4.9.7-alpha-43306';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.