RFR: 8331077 : nroff man page update for jar tool

[Weibing Xiao]

nroff man page update for jar tool. <br>
This update is caused by the change of https://bugs.openjdk.org/browse/JDK-8318971. While the .md man pages got updated in other repos, the corresponding nroff man page was never updated in OpenJDK repos

-------------

Commit messages:
 - 8331077 : nroff man page update for jar tool

Changes: https://git.openjdk.org/jdk/pull/19039/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=19039&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8331077
  Stats: 9 lines in 1 file changed: 4 ins; 0 del; 5 mod
  Patch: https://git.openjdk.org/jdk/pull/19039.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/19039/head:pull/19039

PR: https://git.openjdk.org/jdk/pull/19039