Add doctests for union, diff, sym_diff, and intersection.
Add a rustdoc test for union to exhibit how it is used. There is already a test for union in the test namespace, but this commit adds a doctest that will appear in the rustdocs. Add a doctest for the difference function. Add a doctest for the symmetric_difference function. Add a doctest for the intersection function. Update the union et al. doctests based on @Gankro's comments. Make the union et al. doctests a bit more readable.
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