RFR: 8302789: (fs) Files.copy should include unsupported copy option in exception message [v2]

[Christian Stein]

> This PR also adds the names of unsupported copy options to the the exception message for "Files::move" methods.

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

  Address feedback

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Changes:
  - all: https://git.openjdk.org/jdk/pull/12625/files
  - new: https://git.openjdk.org/jdk/pull/12625/files/0685b858..03accc26

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=12625&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=12625&range=00-01

  Stats: 5 lines in 2 files changed: 0 ins; 0 del; 5 mod
  Patch: https://git.openjdk.org/jdk/pull/12625.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/12625/head:pull/12625

PR: https://git.openjdk.org/jdk/pull/12625