RFR: 8358701: Java API docs for javax.management.remote should not link to JMXMP

[Kevin Walls]

Doc-only cleanup, not part of the API/spec.

Remove link to the very old reference implementation of JMXMP in the Javadoc.  This may misleadingly imply it is a supported part of the JDK.

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Commit messages:
 - 8358701: Java API docs for javax.management.remote should not link to JMXMP

Changes: https://git.openjdk.org/jdk/pull/25670/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=25670&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8358701
  Stats: 16 lines in 1 file changed: 0 ins; 13 del; 3 mod
  Patch: https://git.openjdk.org/jdk/pull/25670.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/25670/head:pull/25670

PR: https://git.openjdk.org/jdk/pull/25670