RFR: 8321139: jlink's man page does not document the --compress option correctly [v2]

[Ana Maria Mihalceanu]

> This PR looks into updating the content of `--compress` option and plugin of `jlink`:
> 
> - Updates the `--compress` option description and warns that previous compression levels are deprecated to be removed in a future release.
> - Updates the `--plugin` option description and warns that previous compression levels are deprecated to be removed in a future release.

Ana Maria Mihalceanu has updated the pull request incrementally with one additional commit since the last revision:

  Remove legacy shortcut for --compress.

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/28359/files
  - new: https://git.openjdk.org/jdk/pull/28359/files/b1517c35..8749e51e

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=28359&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=28359&range=00-01

  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/28359.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/28359/head:pull/28359

PR: https://git.openjdk.org/jdk/pull/28359