8241727: Typos: empty lines in javadoc, inconsistent indents, etc. (core-libs only)

Reviewed-by: prappo

src/java.base/share/classes/java/util/stream/DoubleStream.java

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2012, 2016, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2012, 2020, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -480,7 +480,7 @@ public interface DoubleStream extends BaseStream<Double, DoubleStream> {
      *
      * @apiNote Sum, min, max, and average are all special cases of reduction.
      * Summing a stream of numbers can be expressed as:
-
+     *
      * <pre>{@code
      *     double sum = numbers.reduce(0, (a, b) -> a+b);
      * }</pre>

src/java.base/share/classes/java/util/stream/package-info.java

@@ -729,7 +729,6 @@
  * timing of binding to the data, since the data could change between the time
  * the spliterator is created and the time the stream pipeline is executed.
  * Ideally, a spliterator for a stream would report a characteristic of
-
  * {@code IMMUTABLE} or {@code CONCURRENT}; if not it should be
  * <a href="../Spliterator.html#binding"><em>late-binding</em></a>. If a source
  * cannot directly supply a recommended spliterator, it may indirectly supply