There is a small typo in doc/zone-class.rst.
Should read `translation` rather than `transation`.
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The ``Zone`` class provides a non-thread-safe implementation of a DNS zone,
-as well as a lightweight transation mechanism that allows it to be atomically
+as well as a lightweight translation mechanism that allows it to be atomically
updated. For more complicated transactional needs, or for concurrency, please
use the :py:class:`dns.versioned.Zone` class (described below).