Add missing module documentation

src/experiments/NEC_evaluation/context_sensitivity.py

src/experiments/NEC_evaluation/evaluation.py

src/experiments/finetune_T5/finetune_T5_MLM_entity.py

src/experiments/finetune_T5/finetune_T5_MLM_label.py

src/experiments/finetune_T5/finetune_T5_NLI.py

src/experiments/finetune_T5/plotting/plot_loss.py

src/models/T5_MLM_entity.py

src/models/T5_MLM_label.py

src/models/T5_NLI.py

src/models/Word2Vec.py