[Bug] Running sync examples from documentation result in TypeError: FromIterable() takes no arguments.

[Paperone80]

Describe the bug
Running your sync examples results in TypeError

Minimal code to reproduce
Small snippet that contains a minimal amount of code.
Source: https://cgarciae.github.io/pypeln/api/sync/Overview/

import pypeln as pl
import time
from random import random

def slow_integer_pair(x):
    time.sleep(random()) # <= some slow computation

    if x == 0:
        yield x
    else:
        yield x
        yield -x

data = range(10) # [0, 1, 2, ..., 9]
stage = pl.sync.flat_map(slow_integer_pair, data, workers=3, maxsize=4)

list(stage) # [0, 1, -1, 2, -2, ..., 9, -9]

Expected behavior
No TypeError

Library Info
Please provide os info and elegy version.
Ubuntu: 16.04
Python: 3.9
Pypeln: 0.4.9

Screenshots
If applicable, add screenshots to help explain your problem.

Additional context

---------------------------------------------------------------------------
TypeError                                 Traceback (most recent call last)
Input In [1], in <cell line: 15>()
     12         yield -x
     14 data = range(10) # [0, 1, 2, ..., 9]
---> 15 stage = pl.sync.flat_map(slow_integer_pair, data, workers=3, maxsize=4)
     17 list(stage)

File /opt/intelpython3/envs/python3.9_env_tf2_od/lib/python3.9/site-packages/pypeln/sync/api/flat_map.py:126, in flat_map(f, stage, workers, maxsize, timeout, on_start, on_done)
    113 if isinstance(stage, pypeln_utils.Undefined):
    114     return pypeln_utils.Partial(
    115         lambda stage: flat_map(
    116             f,
   (...)
    123         )
    124     )
--> 126 stage_ = to_stage(stage, maxsize=maxsize)
    128 return Stage(
    129     process_fn=FlatMap(f),
    130     timeout=timeout,
   (...)
    134     f_args=pypeln_utils.function_args(f),
    135 )

File /opt/intelpython3/envs/python3.9_env_tf2_od/lib/python3.9/site-packages/pypeln/sync/api/to_stage.py:12, in to_stage(obj, maxsize)
     10     return obj
     11 else:
---> 12     return from_iterable(obj, maxsize=maxsize)

File /opt/intelpython3/envs/python3.9_env_tf2_od/lib/python3.9/site-packages/pypeln/sync/api/from_iterable.py:62, in from_iterable(iterable, use_thread, maxsize)
     58 if isinstance(iterable, pypeln_utils.Undefined):
     59     return pypeln_utils.Partial(lambda iterable: from_iterable(iterable))
     61 return Stage(
---> 62     process_fn=FromIterable(iterable, maxsize=maxsize),
     63     timeout=0,
     64     dependencies=[],
     65     on_start=None,
     66     on_done=None,
     67     f_args=[],
     68 )

TypeError: FromIterable() takes no arguments