8014393: Minor typo in the spec for j.u.stream.Stream.findFirst()

Reviewed-by: alanb, chegar

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

@@ -603,7 +603,7 @@ public interface DoubleStream extends BaseStream<Double, DoubleStream> {
     /**
      * Returns an {@link OptionalDouble} describing the first element of this
      * stream (in the encounter order), or an empty {@code OptionalDouble} if
-     * the stream is empty.  If the stream has no encounter order, than any
+     * the stream is empty.  If the stream has no encounter order, then any
      * element may be returned.
      *
      * <p>This is a <a href="package-summary.html#StreamOps">short-circuiting

src/share/classes/java/util/stream/IntStream.java

@@ -588,7 +588,7 @@ public interface IntStream extends BaseStream<Integer, IntStream> {
     /**
      * Returns an {@link OptionalInt} describing the first element of this
      * stream (in the encounter order), or an empty {@code OptionalInt} if the
-     * stream is empty.  If the stream has no encounter order, than any element
+     * stream is empty.  If the stream has no encounter order, then any element
      * may be returned.
      *
      * <p>This is a <a href="package-summary.html#StreamOps">short-circuiting

src/share/classes/java/util/stream/LongStream.java

@@ -588,7 +588,7 @@ public interface LongStream extends BaseStream<Long, LongStream> {
     /**
      * Returns an {@link OptionalLong} describing the first element of this
      * stream (in the encounter order), or an empty {@code OptionalLong} if the
-     * stream is empty.  If the stream has no encounter order, than any element
+     * stream is empty.  If the stream has no encounter order, then any element
      * may be returned.
      *
      * <p>This is a <a href="package-summary.html#StreamOps">short-circuiting

src/share/classes/java/util/stream/Stream.java

@@ -754,7 +754,7 @@ public interface Stream<T> extends BaseStream<T, Stream<T>> {
     /**
      * Returns an {@link Optional} describing the first element of this stream
      * (in the encounter order), or an empty {@code Optional} if the stream is
-     * empty.  If the stream has no encounter order, than any element may be
+     * empty.  If the stream has no encounter order, then any element may be
      * returned.
      *
      * <p>This is a <a href="package-summary.html#StreamOps">short-circuiting