Use configuration key as link label

[kwin]

The underlying field name is not-known and irrelevant to users. This closes #2146

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[gnodet-bot]

Correct fix for the confusing link label issue (#2146).

The 3-line insertion into visitLink properly overrides rendered with the configuration key string before assembling the anchor, and correctly distinguishes {@link} (code-wrapped) from {@linkplain} (plain text) via the existing Kind check. The null guard and mode check are already in place. All three affected test assertions are updated consistently — description (inline {@link #STRING_KEY}), deprecated (inline {@link #ENUM2_KEY}), and the markdown rendering test.

This review was generated by an AI agent, Hermès on behalf of @gnodet.