What do these changes do

Corrects type annotation inconsistency in pythainlp/benchmarks/word_tokenization.py docstring.

What was wrong

The _find_word_boundaries function signature correctly specified bin_reps: "np.ndarray", but the docstring incorrectly documented the parameter as str:

def _find_word_boundaries(bin_reps: "np.ndarray") -> list[tuple[int, int]]:
    """Find the starting and ending location of each word.

    :param str bin_reps: binary representation of a text  # ← Wrong type
    ...
    """

This mismatch between type annotation and documentation created confusion for type checkers and developers.

How this fixes it

Updates the docstring parameter type from str to numpy.ndarray:

:param numpy.ndarray bin_reps: binary representation of a text

Your checklist for this pull request

• Passed code styles and structures
• Passed code linting checks and unit test

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