[Documentation] ExecutorBase.submit() missing 1 required positional argument: 'fn'

When the function is set explicitly in the submit() function executorlib raises and error message:

ExecutorBase.submit() missing 1 required positional argument: 'fn'

For example:

import executorlib

def sum_funct(a,b):
    return sum([a, b])

with executorlib.SingleNodeExecutor() as exe:
    f = exe.submit(fn=sum_funct, a=1, b=2)
    print(f.result())

This behavior is consistent with the concurrent.futures.ThreadPoolExecutor which raises a similar error message:

from concurrent.futures import ThreadPoolExecutor

def sum_funct(a,b):
    return sum([a, b])

with ThreadPoolExecutor() as exe:
    f = exe.submit(fn=sum_funct, a=1, b=2)
    print(f.result())

Raises:

TypeError: ThreadPoolExecutor.submit() missing 1 required positional argument: 'fn'

Still there were older versions of executorlib<=1.0.1 which did not raise this error message.

Review the documentation for ExecutorBase.submit() and compare its documented calling convention with the example in the issue and Python's concurrent.futures behavior. Confirm whether the current error is expected and clarify the documented usage or compatibility note accordingly. Done means the submit() behavior and the older-version difference are clearly explained.