Update siddhi-4.0.md
Fixing wrong query in docs
@@ -58,7 +58,7 @@ define stream TempStream (deviceID long, roomNo int, temp double);
@name('5minAvgQuery')
from TempStream#window.time(5 min)
select roomNo, avg(temp) as avgTemp
- group by room
+ group by roomNo
insert into OutputStream;
```
