Docs: Correct the possible return types for the `wpdb::query()` method.

Props isabel104

See #42505

Built from https://develop.svn.wordpress.org/trunk@43017


git-svn-id: http://core.svn.wordpress.org/trunk@42846 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/version.php

@@ -4,7 +4,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '5.0-alpha-43016';
+$wp_version = '5.0-alpha-43017';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.

wp-includes/wp-db.php

@@ -1848,7 +1848,8 @@ class wpdb {
 	 * @since 0.71
 	 *
 	 * @param string $query Database query
-	 * @return int|false Number of rows affected/selected or false on error
+	 * @return int|bool Boolean true for CREATE, ALTER, TRUNCATE and DROP queries. Number of rows
+	 *                  affected/selected for all other queries. Boolean false on error.
 	 */
 	public function query( $query ) {
 		if ( ! $this->ready ) {