RFR: 8256839: JavaDoc for java.time.Period.negated() method

[Naoto Sato]

Hi,

Please review this simple doc fix. Thanks.

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Commit messages:
 - 8256839: JavaDoc for java.time.Period.negated() method

Changes: https://git.openjdk.java.net/jdk/pull/1399/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=1399&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8256839
  Stats: 2 lines in 1 file changed: 0 ins; 0 del; 2 mod
  Patch: https://git.openjdk.java.net/jdk/pull/1399.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/1399/head:pull/1399

PR: https://git.openjdk.java.net/jdk/pull/1399