RFR: 8323089: networkaddress.cache.ttl is not a system property

[Daniel Jeliński]

Please review this documentation change that:
- removes networkcache.cache.*.ttl properties from the [System properties page](https://docs.oracle.com/en/java/javase/21/docs/api/system-properties.html)
- Adds a link to the Security class where security properties are mentioned

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Commit messages:
 - Use linkplain
 - Update InetAddress
 - Update net-properties

Changes: https://git.openjdk.org/jdk/pull/17671/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=17671&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8323089
  Stats: 8 lines in 2 files changed: 0 ins; 0 del; 8 mod
  Patch: https://git.openjdk.org/jdk/pull/17671.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/17671/head:pull/17671

PR: https://git.openjdk.org/jdk/pull/17671