Updated doc based on closure of #387087

What does this MR do?

Removed paragraph

When Keep artifacts from most recent successful jobs is enabled, artifacts are always kept for blocked pipelines. These artifacts expire only after the blocking job is triggered and the pipeline completes. Issue 387087 proposes to change this behavior.

As #387087 (closed) has been resolved/closed.

Related issues

Job artifacts in blocked pipelines (status: man... (#387087 - closed)

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