Added comments

core-kotlin/src/test/kotlin/com/baeldung/filter/SliceTest.kt

@@ -24,6 +24,7 @@ internal class SliceTest {
         assertIterableEquals(expected, actual)
     }
 
+// From the 1.3 version of Kotlin APIs, slice doesn't return array of nulls but throw IndexOutOfBoundsException
 //    @Test
 //    fun whenSlicingBeyondTheRangeOfTheArray_thenContainManyNulls() {
 //        val original = arrayOf(12, 3, 34, 4)

core-kotlin/src/test/kotlin/com/baeldung/fuel/FuelHttpUnitTest.kt

@@ -222,6 +222,8 @@ internal class FuelHttpUnitTest {
 
     }
 
+
+// The new 1.3 coroutine APIs, aren't implemented yet in Fuel Library
 //    @Test
 //    fun whenMakeGETRequestUsingCoroutines_thenResponseStatusCode200() = runBlocking {
 //            val (request, response, result) = Fuel.get("http://httpbin.org/get").awaitStringResponse()
@@ -231,8 +233,8 @@ internal class FuelHttpUnitTest {
 //
 //            }, { error -> })
 //    }
-//
-//
+
+// The new 1.3 coroutine APIs, aren't implemented yet in Fuel Library
 //    @Test
 //    fun whenMakeGETRequestUsingCoroutines_thenDeserializeResponse() = runBlocking {
 //            Fuel.get("https://jsonplaceholder.typicode.com/posts?id=1").awaitObjectResult(Post.Deserializer())