8268664: The documentation of the Scanner.hasNextLine is incorrect

Reviewed-by: rriggs, bpb, iris

src/java.base/share/classes/java/util/Scanner.java

@@ -1600,7 +1600,8 @@ public final class Scanner implements Iterator<String>, Closeable {
      * This method may block while waiting for input. The scanner does not
      * advance past any input.
      *
-     * @return true if and only if this scanner has another line of input
+     * @return true if there is a line separator in the remaining input
+     * or if the input has other remaining characters
      * @throws IllegalStateException if this scanner is closed
      */
     public boolean hasNextLine() {