Update check-cfg blog post with recent Cargo change

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Update check-cfg blog post with recent Cargo change #1336

Closed Urgau closed 5 months ago

Urgau commented 5 months ago

With recent Cargo change, namely https://github.com/rust-lang/cargo/pull/13913, some part of the blog are no longer true/accurate, this PR therefor update some sections to reflect the recent changes.

cc @epage r? @ehuss