Revert "docs: checkpatch: add UNNECESSARY/UNSPECIFIED_INT and UNNECESSARY_ELSE"

This reverts commit cbb817fc

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Late-arriving nacks make it clear that I applied this one too soon.

Link: https://lore.kernel.org/lkml/CAKXUXMzEFQd1JJhx4ZbBQiuSB7Fk3bd7dwJYmPOvEtMqZopxpg@mail.gmail.com/
Signed-off-by: Jonathan Corbet <corbet@lwn.net>