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Fix flatten example in ndarray_for_numpy_users
The old example was missing `.cloned()`. Additionally, it didn't clearly indicate that `use std::iter::FromIterator` is necessary.
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src/doc/ndarray_for_numpy_users/mod.rs

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//! `a[:,np.newaxis]` or `np.expand_dims(a, axis=1)` | [`a.insert_axis(Axis(1))`][.insert_axis()] | create an array from `a`, inserting a new axis 1
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//! `a.transpose()` or `a.T` | [`a.t()`][.t()] or [`a.reversed_axes()`][.reversed_axes()] | transpose of array `a` (view for `.t()` or by-move for `.reversed_axes()`)
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//! `np.diag(a)` | [`a.diag()`][.diag()] | view the diagonal of `a`
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//! `a.flatten()` | [`Array::from_iter(a.iter())`][::from_iter()] | create a 1-D array by flattening `a`
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//! `a.flatten()` | [`use std::iter::FromIterator; Array::from_iter(a.iter().cloned())`][::from_iter()] | create a 1-D array by flattening `a`
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//!
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//! ## Iteration
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//!

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