Fix typo in workspace format documentation (4.1.x)

[jerrison]

Fixing typo.

References

Code changes

User-facing changes

Backwards-incompatible changes

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[krassowski]

Thanks!

[krassowski]

Of note this is fixed on 4.2.x and rewritten to: "A workspace file is a JSON file that contains one object with two required top-level keys, data, and metadata."

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