[docs] Fixed typo in Storm Compatibility page

This closes #1618

docs/apis/streaming/storm_compatibility.md

@@ -228,8 +228,8 @@ DataStream<SplitStreamType<SomeType>> multiStream = ...
 SplitStream<SplitStreamType<SomeType>> splitStream = multiStream.split(new StormStreamSelector<SomeType>());
 
 // remove SplitStreamType using SplitStreamMapper to get data stream of type SomeType
-DataStream<SomeType> s1 = splitStream.select("s1").map(new SplitStreamMapper<SomeType>()).returns(SomeType.classs);
-DataStream<SomeType> s2 = splitStream.select("s2").map(new SplitStreamMapper<SomeType>()).returns(SomeType.classs);
+DataStream<SomeType> s1 = splitStream.select("s1").map(new SplitStreamMapper<SomeType>()).returns(SomeType.class);
+DataStream<SomeType> s2 = splitStream.select("s2").map(new SplitStreamMapper<SomeType>()).returns(SomeType.class);
 
 // do further processing on s1 and s2
 [...]