HACKING.md seems to be out of date

[aochagavia]

I was going through HACKING.md and realized there is some text related to benchmarks that is no longer accurate. Since the file was touched 4 years ago, there might be other things that need updating too.

I'm opening this here because none of the available issue categories seemed fitting.

[BurntSushi]

I created an issue #1058 for this.