Document how to use every-ts bisect run to look for a commit that *fixed* an issue

[danvk]

The docs explain how to use every-ts bisect run to find the commit that broke something, but sometimes you want to find the commit that fixed an issue.

Case in point: I tried to repro #33191 at HEAD today and couldn't. It was fixed sometime after 5.3.2.

I wound up doing it with this script that flips the exit codes. But maybe there's a better way that doesn't require that.

#!/bin/bash

if every-ts tsc -p tsconfig.json ; then
  echo 'good'
  exit 1
else
  echo 'bad'
  exit 0
fi

[jakebailey]

I was aiming not to do write too much on this, under the assumption that I would effectively just repeating the git bisect docs linked in the README.

I wound up doing it with this script that flips the exit codes. But maybe there's a better way that doesn't require that.

My example in the README actually uses the terms old and new for that reason. Though, I see now that I accidentally flipped the example, so I'll fix that quick.