NER ReadMe not updated

[ttsygankova]

The newest training script for the NER in particular says it takes in 4 arguments (train_dir, test_dir, format, config_file), however the documentation still says it takes in 3 (only train_dir, test_dir, config_file). It's also unclear what the various types of acceptable formats are.

I assume that given that the format option was added to most scripts, many of the usage instructions need to be updated.

Also, the test.sh usage actually says "train.sh" even though the description above it states this is the testing script.

[danyaljj]

Thanks for pointing out the issues. Feel free send a "pull request", if you'd like to take on any of these.