RFR: JDK-8326089: Text incorrectly placed in breadcrumbs list in generated docs

[Hannes Wallnöfer]

Please review a simple change to avoid placing non-list content in the breadcrumb navigation bar. The solution I chose is to use the ` > ` separator as list marker for all list items except the first one using the `list-style-type` CSS property. An alternative solution would have been to add the separator character to the list item content, but I think its role is that of a list marker rather than list content.

The visual presentation is very close to the previous solution with tiny bit more spacing between list items.

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Commit messages:
 - JDK-8326089: Text incorrectly placed in breadcrumbs list in generated docs

Changes: https://git.openjdk.org/jdk/pull/17917/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=17917&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8326089
  Stats: 39 lines in 5 files changed: 4 ins; 32 del; 3 mod
  Patch: https://git.openjdk.org/jdk/pull/17917.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/17917/head:pull/17917

PR: https://git.openjdk.org/jdk/pull/17917