Matching mistaken between demo\text_classification\README.md and...

Matching mistaken between demo\text_classification\README.md and demo\text_classification\train.py (#1760)

* Matching mistaken between demo\sequence_labeling\README.md and demo\sequence_labeling\train.py

* Matching mistaken between demo\text_classification\README.md and demo\text_classification\train.py