Merge pull request #1598 from docsolver/patch-1

Small correction in DB\Query comments

framework/yii/db/Query.php

@@ -148,7 +148,7 @@ class Query extends Component implements QueryInterface
 	 * Executes the query and returns a single row of result.
 	 * @param Connection $db the database connection used to generate the SQL statement.
 	 * If this parameter is not given, the `db` application component will be used.
-	 * @return array|boolean the first row (in terms of an array) of the query result. False is returned if the query
+	 * @return array|boolean the first row (in terms of an array) of the query result. Null is returned if the query
 	 * results in nothing.
 	 */
 	public function one($db = null)