Breaking existing numpy docstring.

[galyfray]

When running pyment on a file with already existing docstrings pyment will try to add again the arguments.

Running pyment on the following file

def add(left: int, right: int) -> int:
    """
    Add two intergers together.
    
    Really high tech !

    Parameters
    ----------
    left : int :
        Left element to add
    right : int :
        right element to add
  
    Returns
    -------

    
    """
    return left + right

will result in this file (the bug still occurs with or without the -w arg):

def add(left: int, right: int) -> int:
    """
    Add two intergers together.
    
    Really high tech ! like woa !

    Parameters
    ----------
    left : int :
        Left element to add
    right : int :
        right element to add
    left: int :
        
    right: int :
        

    Returns
    -------

    
    """
    return left + right

I at first thought that pyment was hard checking for the presence of those two lines, but it does not seem to be the case :

def add(left: int, right: int) -> int:
    """
    Add two intergers together.
    
    Really high tech ! like woa !

    Parameters
    ----------
    left : int :
        Left element to add
    right : int :
        right element to add
    left : int :
        
    right : int :
        
    left: int :
        
    right: int :
        

    Returns
    -------

    
    """
    return left + right

Tested on python 3.10.8, pyment 0.3.3