RFR: 8316340: (bf) Missing {@inheritDoc} for exception in MappedByteBuffer::compact

[Brian Burkhalter]

Explicitly add a throws clause for `ReadOnlyBufferException` to the specification of `MappedByteBuffer.compact`.

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Commit messages:
 - 8316340: Missing {@inheritDoc} for exception in MappedByteBuffer::compact

Changes: https://git.openjdk.org/jdk/pull/17835/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=17835&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8316340
  Stats: 2 lines in 1 file changed: 1 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/17835.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/17835/head:pull/17835

PR: https://git.openjdk.org/jdk/pull/17835