Merge pull request #274 from Kivanval/fix/desc

Correcting a comment in StreamEx.java

src/main/java/one/util/streamex/StreamEx.java

@@ -2969,7 +2969,7 @@ public static <T> StreamEx<T> constant(T value, long length) {
  * {@code mapper.apply(list.get(0), list.get(1))},
  * {@code mapper.apply(list.get(0), list.get(2))} and
  * {@code mapper.apply(list.get(1), list.get(2))}. The number of elements in
- * the resulting stream is {@code list.size()*(list.size()+1L)/2}.
+ * the resulting stream is {@code list.size() * (list.size() - 1L) / 2}.
  * 
  * <p>
  * The list values are accessed using {@link List#get(int)}, so the list
@@ -3002,7 +3002,7 @@ public static <U, T> StreamEx<T> ofPairs(List<U> list, BiFunction<? super U, ? s
  * {@code mapper.apply(array[0], array[1])},
  * {@code mapper.apply(array[0], array[2])} and
  * {@code mapper.apply(array[1], array[2])}. The number of elements in the
- * resulting stream is {@code array.length*(array.length+1L)/2}.
+ * resulting stream is {@code array.length * (array.length - 1L) / 2}.
  * 
  * @param <U> type of the array elements
  * @param <T> type of the stream elements