Confusing docstring in assignment 2

[BeneHTWG]

• in the args description of the build_word_frequencies function, the type of the label is defined as list[str]. However in the unit test, the label is an integer numpy column vector
• the type description should be corrected (e.g. with npt.NDArray[np.int_]) and eventually an example would help to identify the exact shape of the vector

[pkeilbach]

Good catch, @BeneHTWG 🚀 Would you want to work on this? My estimation would be 2 bonus points, as this fixes an incorrect type hint and provides a better example.

[BeneHTWG]

@pkeilbach yes, please assign me :)