Make it clearer people should try both compatibilitytools.d directories

[Hooloovoo]

Hello,

Great tool.

I just had a bit of stumble trying to make this work for the first time as a new user. The instructions say:
Download and unpack tarball to compatibilitytools.d directory (create one if it does not exist):

$ cd ~/.local/share/Steam/compatibilitytools.d/ || cd ~/.steam/root/compatibilitytools.d/
$ curl -L https://github.com/dreamer/boxtron/releases/download/v0.5.4/boxtron.tar.xz | tar xJf -

I am using Ubuntu 20.04 and neither of these directories existed for me. I therefore created ~/.local/share/Steam/compatibilitytools.d/, put the tool in there and was surprised nothing happened. It was actually only when I searched around and read issue #1 that I thought to try the other install directory -- I had mistakenly understood that either should work and that using the first of the two would be fine.

Maybe it was just me being silly, but in case others make the same mistake perhaps you could rephrase "(create one if it does not exist)" to "(create one if it does not exist -- you may have to try both to see which works for you)" or something?

Thanks again.