W505 not triggered on multi-line docstring

[Andy-Dihong-Luo]

I've enabled W505 and set max-doc-length to 72. However, it didn't trigger when I exceed the limit on muti-line docstring.
For example:

def foo():
    """A VERY-LONG summary that exceed 72 characters."""  # W505 triggered as usual 
    return

However:

def foo():
    """A short summary.
   
    A VERY-LONG description that exceed 72 characters.  # Nothing happened
    """
    return

I'd like to know if it's a bug or it's as designed. As instructed in PEP 8, docstrings should be wrapped at 72 characters, and Ruff is expected to warn that.

[Andy-Dihong-Luo]

Solved in #4347.