[Python] Why is a docstring sufficient to satisfy a python's definition of a function when its...

I discovered this fun feature of Python, where this:

def do_nothing():
"""Does nothing."""


is the same as this:

def do_nothing():
...


I found someone commented this here: "If you give your function a docstring, you don't even need to put any statement after the line with the docstring."

Could someone explain why the docstring acts as a no-op?

I have searched through the python language reference, and I see that python's function definition requires the body to have a statement. I looked at the statement definition in CPython, and I don't see any references to an Ellipsis or docstring as a valid statement: https://docs.python.org/3/reference/compound_stmts.html

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