RFR 9: 8167166 : Java API docs mention a non-existent method getNanosOfSecond

[Roger Riggs]

(With correct cr.openjdk.java.net link).

Please review a corrected javadoc link correction in java.time.Instant.

Webrev:
   http://cr.openjdk.java.net/~rriggs/webrev-nano-8167166/

Thanks, Roger