Numpy docstring template doesn't work

As outlined in the help text, I put 
```
    """{{_header_}}

    {{_arg_}} :{{_lf_}}{{_indent_}}    {{_arg_}} is
    """
```
in `multi.txt`.
When running `:Pydocstring`, this is the result:
```
def foo(a, b, c):
    """foo


{{_arg_}} :{{_lf_}}        {{_arg_}} is
    """
    pass
```