docs(sector): show the current textile country key in the example

[LKSNDRTMLKV]

SectorData's doc comment showed a textile example carrying
"countryOfManufacturing" directly above a struct that requires
countryOfOrigin — the old key from before the cross-sector rename.

Named in #94 as still visible in the crate's own docs. It is the smallest piece
of that issue and unrelated to the rest, so it goes on its own rather than
riding along with the compatibility gate in #174.

Nothing reads this string, which is exactly why it drifted: cargo doc, clippy
and the test suite all pass over prose without checking it against the type
beside it.

just lint and the doctests pass.

[codacy-production]

Up to standards ✅

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