Add NumPy examples combining slicing and assignment

Author: jturner314

src/doc/ndarray_for_numpy_users/mod.rs

@@ -531,6 +531,8 @@
 //! ------|-----------|------
 //! `a[:] = 3.` | [`a.fill(3.)`][.fill()] | set all array elements to the same scalar value
 //! `a[:] = b` | [`a.assign(&b)`][.assign()] | copy the data from array `b` into array `a`
+//! `a[:5, 2] = 3.` | [`a.slice_mut(s![..5, 2]).fill(3.)`][.fill()] | set a portion of the array to the same scalar value
+//! `a[:5, 2] = b` | [`a.slice_mut(s![..5, 2]).assign(&b)`][.assign()] | copy the data from array `b` into part of array `a`
 //! `np.concatenate((a,b), axis=1)` | [`concatenate![Axis(1), a, b]`][concatenate!] or [`concatenate(Axis(1), &[a.view(), b.view()])`][concatenate()] | concatenate arrays `a` and `b` along axis 1
 //! `np.stack((a,b), axis=1)` | [`stack![Axis(1), a, b]`][stack!] or [`stack(Axis(1), vec![a.view(), b.view()])`][stack()] | stack arrays `a` and `b` along axis 1
 //! `a[:,np.newaxis]` or `np.expand_dims(a, axis=1)` | [`a.slice(s![.., NewAxis])`][.slice()] or [`a.insert_axis(Axis(1))`][.insert_axis()] | create an view of 1-D array `a`, inserting a new axis 1