chore: clarify example for nans on numbers page

docs/topics/numbers.md

@@ -303,10 +303,16 @@ Here is an example that shows the difference in behavior between operands static
 ```kotlin
 fun main() {
     //sampleStart
+    // Operand statically typed as floating-point number
     println(Double.NaN == Double.NaN)                 // false
+    // Operand NOT statically typed as floating-point number
+    // So NaN is equal to itself
     println(listOf(Double.NaN) == listOf(Double.NaN)) // true
-
+
+    // Operand statically typed as floating-point number
     println(0.0 == -0.0)                              // true
+    // Operand NOT statically typed as floating-point number
+    // So -0.0 is less than 0.0
     println(listOf(0.0) == listOf(-0.0))              // false
 
     println(listOf(Double.NaN, Double.POSITIVE_INFINITY, 0.0, -0.0).sorted())