[jdk23] RFR: 8336259: Wrong link to stylesheet.css in JavaDoc API documentation

[Chen Liang]

Please review the backport of #20145 onto jdk23, fixing 2 unnecessary and erroneous links in the doc files.

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Commit messages:
 - Backport 5bc86f332986e3fffc1363f569029bb73a706064

Changes: https://git.openjdk.org/jdk/pull/20166/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=20166&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8336259
  Stats: 4 lines in 2 files changed: 0 ins; 2 del; 2 mod
  Patch: https://git.openjdk.org/jdk/pull/20166.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/20166/head:pull/20166

PR: https://git.openjdk.org/jdk/pull/20166