RFR: JDK-8300594: Use generalized see and link tags in UnicastRemoteObject

[Joe Darcy]

Use improved anchor syntax in UnicastRemoteObject.

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Commit messages:
 - JDK-8300594: Use generalized see and link tags in UnicastRemoteObject

Changes: https://git.openjdk.org/jdk/pull/12083/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=12083&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8300594
  Stats: 4 lines in 1 file changed: 0 ins; 2 del; 2 mod
  Patch: https://git.openjdk.org/jdk/pull/12083.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/12083/head:pull/12083

PR: https://git.openjdk.org/jdk/pull/12083