docs: show string status names in key-concept examples

[braden-w]

This PR updates the key-concept page to include string status name alternatives in the examples. This is part of a broader effort (PRs #739, #740, #742-#745) to improve string status name visibility throughout the documentation.

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Reviewing files that changed from the base of the PR and between 5e5da8b and b1d0dcf.

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• docs/key-concept.md (1 hunks)

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[braden-w]

Superseded by #747 (conversions)