RFR: 8357376: Disable syntax highlighting for JDK API docs

[Hannes Wallnöfer]

Please review a trivial change to disable syntax highlighting in JDK API docs.

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Commit messages:
 - 8357376: Disable syntax highlighting for JDK API docs

Changes: https://git.openjdk.org/jdk/pull/25348/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=25348&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8357376
  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/25348.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/25348/head:pull/25348

PR: https://git.openjdk.org/jdk/pull/25348