RFR: 8288080: (fc) FileChannel::map for MemorySegments should state it always throws UOE

[Brian Burkhalter]

`FileChannel::map` for `MemorySegment`s should state it always throws UOE.

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Commit messages:
 - Backport a9c2ab67c44872ce0247aef6bf972bf4246b44be

Changes: https://git.openjdk.org/jdk19/pull/63/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk19&pr=63&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8288080
  Stats: 3 lines in 1 file changed: 3 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk19/pull/63.diff
  Fetch: git fetch https://git.openjdk.org/jdk19 pull/63/head:pull/63

PR: https://git.openjdk.org/jdk19/pull/63