Revert Cargo Book changes for default edition #8551
Merged
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On #8543 it was introduced a change on the Cargo Book docs
where it was incorrectly stated that the default edition for
the Cargo Manifest was
2018
when indeed, as @ehuss correctly statedin #8543 (comment)
it is not.
Therefore, as @Eh2406 asked for, I made the PR reverting this changes
and leaving the Cargo Book docs as they were before.