Fix incorrect command

WordCount/run_wordcount.sh

@@ -16,6 +16,6 @@ yarn jar "$dirname/hadoop-streaming.jar" \
 -reducer red.py \
 -file map.py \
 -file red.py \
--numreducer 10 \
+-numreducetasks 10 \
 -jobconf mapred.job.queue.name=$hadoop_queue_name