Parse the object's docstring and return a `_DocstringInfo`. This function clears @@'s from the docstring, and replaces @{} references with markdown links. For links within the same set of docs, the `relative_path_to_root` for a docstring on the page for `full_name` can be set to: ```pyt
(py_object, relative_path_to_root, reference_resolver)
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