Docs: Improve first-order clause documentation for the `$meta_query` parameter in the constructor for `WP_Meta_Query`.

First-order meta query clauses are defined as clauses that have either a 'key' or 'value' array key. When using named first-order clauses in meta queries to order results in the parent query, `WP_Meta_Query` can additionally accept first-order clauses at the sub-clause level, which was not previous documented.

Fixes #32659.

Built from https://develop.svn.wordpress.org/trunk@37688


git-svn-id: http://core.svn.wordpress.org/trunk@37654 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/class-wp-meta-query.php

@@ -114,8 +114,8 @@ class WP_Meta_Query {
 	 * @access public
 	 *
 	 * @param array $meta_query {
-	 *     Array of meta query clauses. When first-order clauses use strings as their array keys, they may be
-	 *     referenced in the 'orderby' parameter of the parent query.
+	 *     Array of meta query clauses. When first-order clauses or sub-clauses use strings as
+	 *     their array keys, they may be referenced in the 'orderby' parameter of the parent query.
 	 *
 	 *     @type string $relation Optional. The MySQL keyword used to join
 	 *                            the clauses of the query. Accepts 'AND', or 'OR'. Default 'AND'.

wp-includes/version.php

@@ -4,7 +4,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '4.6-alpha-37687';
+$wp_version = '4.6-alpha-37688';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.