RFR: 8357796: Stylesheet adjustments after JDK-8357452

[Hannes Wallnöfer]

Please review a simple stylesheet change to adjust for the removal of code span highlights in [JDK-8357452](https://bugs.openjdk.org/browse/JDK-8357452).

Both of the (subtle) changes undone in this PR were introduced with code span highlights and are no longer needed.

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Commit messages:
 - JDK-8357796: Stylesheet adjustments after JDK-8357452

Changes: https://git.openjdk.org/jdk/pull/25454/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=25454&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8357796
  Stats: 2 lines in 1 file changed: 1 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/25454.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/25454/head:pull/25454

PR: https://git.openjdk.org/jdk/pull/25454