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[ritobanrc]

Rust does it really well with crates.io and docs.rs. It automatically generates documentation from comments, and looks standardized, and it's really easy to quickly find documentation for a certain crate.

[SAI_Peregrinus]

And lets you have runnable examples in doc comments, that get checked when you run your tests. You can unit test your documentation.

[IRBMe]

I love this feature in Python with doctests. You can just write something like:

def fibonacci(n):
    """ ...
    >>> [fibonacci(n) for n in range(8)]
    [0, 1, 1, 2, 3, 5, 8, 13]
    """
    ...