Fix ActiveCount metric name in JMX documentation
Fix ActiveCount metric name in JMX documentation

Praveen2112/presto,dain/presto,dain/presto,losipiuk/presto,losipiuk/presto,11xor6/presto,11xor6/presto,electrum/presto,Praveen2112/presto,Praveen2112/presto,dain/presto,electrum/presto,smartnews/presto,smartnews/presto,electrum/presto,11xor6/presto,ebyhr/presto,losipiuk/presto,dain/presto,11xor6/presto,smartnews/presto,ebyhr/presto,11xor6/presto,smartnews/presto,smartnews/presto,losipiuk/presto,electrum/presto,Praveen2112/presto,ebyhr/presto,electrum/presto,dain/presto,Praveen2112/presto,losipiuk/presto,ebyhr/presto,ebyhr/presto