RFR: 8297134: Add a @sealedGraph tag to InetAddress

[Per Minborg]

This PR proposes to opt in for graphic rendering of the sealed hierarchy of the `InetAddress` class.

Rendering capability was added via https://bugs.openjdk.org/browse/JDK-8295653

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Commit messages:
 - Add a @sealedGraph tag to InetAddress

Changes: https://git.openjdk.org/jdk/pull/11184/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=11184&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8297134
  Stats: 1 line in 1 file changed: 1 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/11184.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/11184/head:pull/11184

PR: https://git.openjdk.org/jdk/pull/11184