Results 3 issues of Huy Tran

I am trying to execute `run_coqa.sh` file with this command: ``` bash run_coqa.sh \ --gpudevice=0 \ --numgpus=1 \ --taskname=coqa \ --randomseed=100 \ --predicttag=xxxxx \ --modeldir=./model/xlnet_cased_L-24_H-1024_A-16 \ --datadir=./data \ --outputdir=./output_folder \...

I added some scripts to create the clickable table of contents for the book.

I saw this example from the document about how to implement multiple steps with `mrjob` [here](https://mrjob.readthedocs.io/en/latest/guides/writing-mrjobs.html#multi-step-jobs): ```python from mrjob.job import MRJob from mrjob.step import MRStep import re WORD_RE = re.compile(r"[\w']+")...