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feat: add a Module.Finite instance for units of number field (#7412)
Add the following instance ```lean instance : Module.Finite ℤ (Additive (𝓞 K)ˣ) ``` To prove this instance, it is helpful to add some `rfl` lemmas about `Additive` and `AddMonoidHom.toIntLinearMap` This PR also fixes a couple of typo in the docstring
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