Remove unreleased link as its already available

Editor assessment

The subject states the change and the reason in one line: the unreleased link removed because the target is already available. The docs type suits the changelog fix, and the absent scope is tolerable. No body is present, which is acceptable because the subject embeds the motivation — a dangling link — completely, leaving nothing for a diff to explain. The PR reference is well-formed. Imperative mood, no trailing period, compact length. A precise, self-sufficient docs-fix message where headline and rationale coincide.