📝 fix docs

from deepchem.metrics.metric import to_one_hot

from deepchem.metrics.metric import from_one_hot

# sklearn & scipy scoring function

# sklearn & scipy score function

from deepchem.metrics.score_function import matthews_corrcoef

from deepchem.metrics.score_function import recall_score

from deepchem.metrics.score_function import kappa_score

from deepchem.metrics.score_function import balanced_accuracy_score

from deepchem.metrics.score_function import pearsonr

# original scoring function

# original score function

from deepchem.metrics.score_function import pearson_r2_score

from deepchem.metrics.score_function import jaccard_index

from deepchem.metrics.score_function import pixel_error