Docs: Add documentation to `get_query_var()` and `WP_Query::get()` for the optional `$default` argument, introduced in 3.9 in [27304].

Props swissspidy.
Fixes #33856.

Built from https://develop.svn.wordpress.org/trunk@34284


git-svn-id: http://core.svn.wordpress.org/trunk@34248 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/query.php

@@ -15,12 +15,13 @@
  * Retrieve variable in the WP_Query class.
  *
  * @since 1.5.0
+ * @since 3.9.0 The `$default` argument was introduced.
  *
  * @global WP_Query $wp_query
  *
  * @param string $var       The variable key to retrieve.
- * @param mixed  $default   Value to return if the query variable is not set. Default ''.
+ * @param mixed  $default   Optional. Value to return if the query variable is not set. Default empty.
- * @return mixed
+ * @return mixed Contents of the query variable.
  */
 function get_query_var( $var, $default = '' ) {
 	global $wp_query;
@@ -2358,11 +2359,13 @@ class WP_Query {
 	 * Retrieve query variable.
 	 *
 	 * @since 1.5.0
+	 * @since 3.9.0 The `$default` argument was introduced.
+	 *
 	 * @access public
 	 *
 	 * @param string $query_var Query variable key.
-	 * @param mixed  $default   Value to return if the query variable is not set. Default ''.
+	 * @param mixed  $default   Optional. Value to return if the query variable is not set. Default empty.
-	 * @return mixed
+	 * @return mixed Contents of the query variable.
 	 */
 	public function get( $query_var, $default = '' ) {
 		if ( isset( $this->query_vars[ $query_var ] ) ) {

wp-includes/version.php

@@ -4,7 +4,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '4.4-alpha-34283';
+$wp_version = '4.4-alpha-34284';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.