docs: update full.md

[chaewonkong]

Summary

Fix misguiding documentation.

pm2 ecosystem yields ecosystem.config.js not process.yml.

Running pm2 start process.yml will generates an error below:

[PM2][ERROR] File process.yml not found

As-is

bash bash
$ pm2 start process.yml

### To-Be
```bash
$ pm2 start ecosystem.config.js
```	```