RFR: 8288529: broken link in java.xml

[Joe Wang]

Some of the links cause redirection, iso.org in particular took 1-2 seconds, that looks like was longer than the wait time of the doccheck and docs link checker. Changed it to the current homepage to avoid redirection. Also changed other links within this package. 

I'm limiting the change to this package only as iso.org only appears in it and other redirections have not caused any issue (tests showed they were almost instant).

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Commit messages:
 - 8288529: broken link in java.xml

Changes: https://git.openjdk.org/jdk19/pull/55/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk19&pr=55&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8288529
  Stats: 7 lines in 1 file changed: 0 ins; 0 del; 7 mod
  Patch: https://git.openjdk.org/jdk19/pull/55.diff
  Fetch: git fetch https://git.openjdk.org/jdk19 pull/55/head:pull/55

PR: https://git.openjdk.org/jdk19/pull/55