Misleading documentation about protocols

[drakulavich]

Taking the first steps with playwright. Was stuck with one part of the documentation:
https://github.com/playwright-community/jest-process-manager#protocol

Turned out that it's not a protocol. It's a "resource prefix" from wait-on library.
So, http means HTTP HEAD returns 2XX response. In my case, I had to change it to http-get to work properly.

Please, mention wait-on in readme explicitly.

[mmarkelov]

@drakulavich yeah! I'm agree with you. I'll try to write it in cleaner way