<i18n dev> RFR: 8365175: Replace Unicode extension anchor elements with link tag

[Iris Clark]

On Thu, 28 Aug 2025 20:23:32 GMT, Justin Lu <jlu at openjdk.org> wrote:

> This PR is a cleanup change which replaces anchor element references of the Locale `def_locale_extension` section with the Javadoc link tag. This is a doc only change and is a result of the discussion in the PR of https://github.com/openjdk/jdk/pull/26683.
> 
> This includes one additional conversion of the `legacy_language_codes` section to get rid of all Locale.html anchor element references.

Marked as reviewed by iris (Reviewer).

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PR Review: https://git.openjdk.org/jdk/pull/26996#pullrequestreview-3166480191