RFR: 8309670: java -help output for --module-path / -p is incomplete [v2]

[Christian Stein]

> Please review this update to `java`'s help output for `--module-path`/`-p`.
> 
> This PR also updates the output for the closely related `--upgrade-module-path` option.
> 
> Thanks in advance!

Christian Stein has updated the pull request incrementally with one additional commit since the last revision:

  Update java.1 man page

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/14564/files
  - new: https://git.openjdk.org/jdk/pull/14564/files/c45531b5..f24027ad

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=14564&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=14564&range=00-01

  Stats: 12 lines in 1 file changed: 5 ins; 0 del; 7 mod
  Patch: https://git.openjdk.org/jdk/pull/14564.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/14564/head:pull/14564

PR: https://git.openjdk.org/jdk/pull/14564