String error at ~/src/supply-agreement-loc/text/grammar.tem.md

[EasonC13]

Hi, This is Eason.
I am the GSoC Student at Accord Project working on Automatic Identification And Classification of Contract Data Types with NLP Models.

Currently, I'm working on data mining for contract template library to analyze and prepare data for Deep Learning.
And I will report some bug I found durning my work.

I found a bug at ~/src/supply-agreement-loc/text/grammar.tem.md and ~/src/supply-agreement-loc/text/sample.md around line 85

the text currently is : the {[exporter}} consents in writing, or
I expect it is: the {{exporter}} consents in writing, or

It should be {{ not {[

Also, I want to know what should I do if I found similar bug afterward.
Can I send PR directly?
Or Should I open an issue like this one?

Thanks for your attention.