coafile spec should have real examples

[sils]

http://coala-docs.readthedocs.io/en/latest/Users/coafile.html

Usability testing has shown that people visit that site and expect to see example on how to configure actual bears, making the examples more realistic and less abstract could help them.

[yash-nisar]

This is the updated link http://coala.readthedocs.io/en/latest/Users/coafile.html