Update README.md

Author: Jolanrensen

README.md

@@ -87,7 +87,7 @@ val spark = SparkSession
 ```kotlin
 spark.toDS("a" to 1, "b" to 2)
 ```
-The example above produces `Dataset<Pair<String, Int>>`.
+The example above produces `Dataset<Pair<String, Int>>`. While Kotlin Pairs and Triples are supported, Scala Tuples are reccomended for better support.
 
 ### Null safety
 There are several aliases in API, like `leftJoin`, `rightJoin` etc. These are null-safe by design. 
@@ -104,7 +104,7 @@ After work block ends, `spark.stop()` is called automatically.
 ```kotlin
 withSpark {
     dsOf(1, 2)
-            .map { it to it }
+            .map { it X it } // creates Tuple2<Int, Int>
             .show()
 }
 ```