from typing import List


def _get_docstring_var_description(var_doc: str) -> str:
    """
    Get a description of argument or return value from docstring.

    Parameters
    ----------
    var_doc : str
        Docstring's part of argument or return value.

    Returns
    -------
    description : str
        Description of argument or return value.
    """
    var_doc = var_doc.rstrip()
    splitted_list: List[str] = var_doc.split('\n')
    if len(splitted_list) < 2:
        return ''
    description: str = '\n'.join(splitted_list[1:])
    description = description.rstrip()
    return description