Add doc string to Array.from

Author: chaitanyav

library/src/scala/Array.scala

@@ -55,6 +55,19 @@ object Array {
  */
  def newBuilder[T](implicit t: ClassTag[T]): ArrayBuilder[T] = ArrayBuilder.make[T](t)
 
+ /** Build an array from the iterable collection.
+ *
+ * {{{
+ * scala> val a = Array.from(Seq(1, 5))
+ * val a: Array[Int] = Array(1, 5)
+ *
+ * scala> val b = Array.from(Range(1, 5))
+ * val b: Array[Int] = Array(1, 2, 3, 4)
+ * }}}
+ *
+ * @param it the iterable collection
+ * @return an array consisting of elements of the iterable collection
+ */
  def from[A : ClassTag](it: IterableOnce[A]): Array[A] = it match {
  case it: Iterable[A] => it.toArray[A]
  case _ => it.iterator.toArray[A]