Compare the documentation of `symlink_to()` and `link_to()`:

.. method:: Path.symlink_to(target, target_is_directory=False)
    Make this path a symbolic link to *target*.

.. method:: Path.link_to(target)
    Create a hard link pointing to a path named *target*.

In fact, `link_to()` does something like:

    Make *target* a hard link to this path.

Which is unexpected given the naming and inconsistency with `symlink_to()`, but it's the way the current implementation works, and so the documentation should reflect that.

Adding a replacement `hardlink_to()` function is covered here in bpo-39950.