fix imperative code snippet in scala-features.md #2322
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This minor PR slightly modifies the imperative code snippet such that it is executable. More precisely, its previous version was returning the error
Not found: type ListBuffer. While I see that this is just a toy example to show beginners what not to do in Scala, I'd think it would be helpful if the code snippet was executable nonetheless.This patch also makes the next line of code, i.e.,
val newNumbers = oldNumbers.map(_ * 2), executable.