Summary lines with dots are split even if within line length and merely using an abbrv.

[JoElfner]

Summary lines with dots are split even if within line length and merely using an abbrv.

See

def foo(my_num: float) -> float:
    """
    Use an abbrv. in the summary line.

    ....
    """

is split to

def foo(my_num: float) -> float:
    """
    Use an abbrv. 

    in the summary line.

    ....
    """

which is of course not as intended.