Wrapped text gets repeated in some cases

[fvisin]

I noticed that when docstrings get wrapped the text is repeated twice on the new line. Weirdly enough, this happens only when the number of letters of the word that is being wrapped is 3 or 4, and the word begins with a letter.

Example:

class Example(object):
    """ Some docstring

    Parameters
    ----------------
    first_param: int
        The last word should be three of four letters long and begin
        with
    """

gets wrapped as:

class Example(object):
    """ Some docstring

    Parameters
    ----------------
    first_param: int
        The last word should be three of four letters long and begin
        withwith
    """