[doc] Fix typos

src/mednet/data/augmentations.py

src/mednet/data/datamodule.py

src/mednet/data/split.py

src/mednet/data/typing.py

src/mednet/engine/predictor.py

src/mednet/engine/saliency/completeness.py

src/mednet/engine/saliency/evaluator.py

src/mednet/engine/saliency/generator.py

src/mednet/engine/saliency/interpretability.py

src/mednet/engine/saliency/viewer.py

src/mednet/engine/trainer.py