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Hash#update

Is there some reason that ruby-doc.org presents the merge method in the
example block for update method ?

<a href="https://ruby-doc.org/core-2.5.1/Hash.html#update-method" title="https://ruby-doc.org/core-2.5.1/Hash.html#update-method">https://ruby-doc.org/core-2.5.1/Hash.html#update-method</a>

thank you,
-az