Order by docs incorrectly state that order by happens on one node

https://impala.apache.org/docs/build/html/topics/impala_order_by.html

"because the entire result set must be produced and transferred to one node before the sorting can happen." is incorrect. If there is an "ORDER BY" clause in a select block, then first data is sorted locally by each impala daemon, then streamed to the coordinator, which merges the sorted result sets.