docs: update example in getting started

[pi0]

Randomly noticed when blindly copy-pasting example there is an extra ). Also added mf.dispose() to make example more complete.

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[mrbbot]

Great catch, thanks for fixing this! ✅

[olljanat]

@pi0 do you happen to have more complete example how to get started with this?

I mean things like:

1. Do I need create Worker project first and install to miniflare package to there?
2. Which file that example should be put.
3. Any other needed configuration files needed to get started.

I ended up to see just a lot of errors which does not make any sense.

EDIT: Found working example from your repository https://github.com/pi0/miniflare-reproduction
Thank you ❤️