RFR: 8321561: (fs) Add an API note to Files.move clarifying possible non-atomic behavior [v2]

[Brian Burkhalter]

> Make it clear that a `FileAlreadyExistsException` may be thrown by `Files.move` even if the `REPLACE_EXISTING` option is specified.

Brian Burkhalter has updated the pull request incrementally with one additional commit since the last revision:

  8321561: Update verbiage instead of adding API note

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Changes:
  - all: https://git.openjdk.org/jdk/pull/17061/files
  - new: https://git.openjdk.org/jdk/pull/17061/files/22d13f6c..ee6fbfcb

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=17061&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=17061&range=00-01

  Stats: 18 lines in 1 file changed: 7 ins; 9 del; 2 mod
  Patch: https://git.openjdk.org/jdk/pull/17061.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/17061/head:pull/17061

PR: https://git.openjdk.org/jdk/pull/17061